Name

AOKI, Takao

Official Title

Professor

Affiliation

(School of Advanced Science and Engineering)

Contact Information

URL

Web Page URL

http://www.qo.phys.waseda.ac.jp/index.html

Grant-in-aids for Scientific Researcher Number
10343146

Sub-affiliation

Sub-affiliation

Faculty of Science and Engineering(Graduate School of Advanced Science and Engineering)

Affiliated Institutes

自己組織系物理ホリスティック研究所

研究所員 2011-2014

理工学術院総合研究所(理工学研究所)

兼任研究員 2018-

ホリスティック物理学研究所

研究所員 2015-2019

ホリスティック物理学研究所

研究所員 2019-

Research interests Career

Quantum Optics

Individual research allowance

Paper

Strong interactions of single atoms and photons near a dielectric boundary

D. J. Alton, N. P. Stern, T. Aoki, H. Lee, E. Ostby, K. J. Vahala, and H. J. Kimble

Nature Physics 7p.1592011-

Fabrication of Ultralow-Loss Tapered Optical Fibers and Microtoroidal Resonators

T. Aoki

Jpn. J. Appl. Phys. 49p.1180012010-

Quantum error correction beyond qubits

T. Aoki, G. Takahashi, T. Kajiya, J. Yoshikawa, S. L. Braunstein, P. van Loock, and A. Furusawa

Nature Physics 5p.5412009-

Efficient Routing of Single Photons by One Atom and a Microtoroidal Cavity

T. Aoki, A. S. Parkins, D. J. Alton, C. A. Regal, B. Dayan, E. Ostby, K. J. Vahala, and H. J. Kimble

Phys. Rev. Lett. 102p.0836012009-

A Photon Turnstile Dynamically Regulated by One Atom

B. Dayan, A. S. Parkins, T. Aoki, E. P. Ostby, K. J. Vahala, and H. J. Kimble

Science 319p.10622008-

Generation of continuous-wave broadband entangled beams using periodically-poled lithium niobate waveguides

K. Yoshino, T. Aoki and A. Furusawa

Appl. Phys. Lett. 90p.0411112007-

Observation of strong coupling between one atom and a monolithic microresonator

T. Aoki, B. Dayan, E. Wilcut, W. P. Bowen, A. S. Parkins, T. J. Kippenberg, K. J. Vahala, and H. J. Kimble

Nature 443p.6712006-

Squeezing at 946 nm with periodically-poled KTiOPO4

T. Aoki, G. Takahashi, and A. Furusawa

Optics Express 14p.69302006-

Demonstration of Quantum Telecloning of Optical Coherent States

S. Koike, H. Takahashi, H. Yonezawa, N. Takei, S.L. Braunstein, T. Aoki and A. Furusawa

Phys. Rev. Lett. 96p.0605042006-

Experimental demonstration of quantum teleportation of a squeezed state

N. Takei, T. Aoki, S. Koike, K. Yoshino, K. Wakui, H. Yonezawa, T. Hiraoka, J. Mizuno, M. Takeoka, M. Ban, and A. Furusawa

Phys. Rev. A 72p.0423042005-

High-fidelity teleportation beyond the no-cloning limit and entanglement swapping for continuous variables

N. Takei, H. Yonezawa, T. Aoki, and A. Furusawa

Phys. Rev. Lett. 94p.2205022005-

Demonstration of a quantum teleportation network for continuous variables

H. Yonezawa, T. Aoki, and A. Furusawa

Nature 431p.4302004-

Experimental creation of a fully inseparable tripartite continuous-variable state

T. Aoki, N. Takei, H. Yonezawa, K. Wakui, T. Hiraoka, A. Furusawa, and P. van Loock

Phys. Rev. Lett. 91p.0804042003-

Biexcitonic effects in the time integrated four-wave mixing with picosecond pulses

T. Aoki, Yu. P. Svirko, and M. Kuwata-Gonokami

Solid State Commun 127p.1972003-

Coherent exciton-biexciton dynamics in GaN

K. Kyhm, R. A. Taylor, J. F. Ryan, T. Aoki, M. Kuwata-Gonokami, B. Beaumon, and P. Gibart

Phys. Rev. B 65p.1931022002-

Time-integrated four-wave mixing in GaN and ZnSe: Polarization-sensitive phase shift of excitonic quantum beats

T. Aoki, G. Mohs, Yu. P. Svirko, and M. Kuwata-Gonokami

Phys. Rev. B 64p.0452122001-

DOI

Room-temperature random telegraph noise in luminescence from macroscopic InGaN clusters

T. Aoki, Y. Nishikawa, and M. Kuwata-Gonokami

Appl. Phys. Lett. 78p.10652001-

Quantum beats of free and bound excitons in GaN

K. Kyhm, R. A. Taylor, J. F. Ryan, T. Aoki, M. Kuwata-Gonokami, B. Beaumon, and P. Gibart

Appl. Phys. Lett. 79p.10972001-

Comparison of exciton-biexciton with bound exciton-biexciton dynamics in GaN: Quantum beats and temperature dependence of the acoustic-phonon interaction

K. Kyhm, R. A. Taylor, J. F. Ryan, T. Aoki, M. Kuwata-Gonokami, B. Beaumon, and P. Gibart

Phys. Status Solidi B 228p.4752001-

Role of exciton-exciton interaction on resonant third-order nonlinear optical responses

M. Kuwata-Gonokami, T. Aoki, C. Ramkumar, R. Shimano, and Yu. P. Svirko

J. Lumin. 87p.1622000-

Quantitaitve study of exciton-exciton interaction in a GaAs microcavity

C. Ramkumar, T. Aoki, R. Shimano, Yu. P. Svirko, T. Kise, T. Someya, H. Sakaki, and M. Kuwata-Gonokami

J. Phys. Soc. Jpn. 69p.24392000-

Influence of exciton-exciton interaction on quantum beats

T. Aoki, G. Mohs, M. Kuwata-Gonokami, and A. A. Yamaguchi

Phys. Rev. Lett. 82p.31081999-

On the gain mechanism in GaN based laser diodes

G. Mohs, T. Aoki, R. Shimano, M. Kuwata-Gonokami, and S. Nakamura

Solid State Commun 109p.1051998-

Failure of the modal gain model in a GaN based laser diode

G. Mohs, T. Aoki, T. Nagai, R. Shimano, M. Kuwata-Gonokami, and S. Nakamura

Solid State Commun 104p.6431997-

Polarization dependent quantum beats of homogeneously broadened excitons

T. Aoki, G. Mohs, T. Ogasawara, R. Shimano, M. Kuwata-Gonokami, and A. A. Yamaguchi

Optics Express 1p.3641997-

Properties of a Single Photon Generated by a Solid-State Emitter: Effects of Pure Dephasing

Iyoda, Eiki;Kato, Takeo;Aoki, Takao;Edamatsu, Keiichi;Koshino, Kazuki

JOURNAL OF THE PHYSICAL SOCIETY OF JAPAN 82(1) 2013-2013

DOIWoS

Detail

ISSN:0031-9015

On the Chirp of Narrowband Terahertz Pulses Generated by Photomixing with Nonlinearly Chirped Laser Pulse Pairs

Kamada, Shohei;Murata, Shuhei;Aoki, Takao

APPLIED PHYSICS EXPRESS 6(3) 2013-2013

DOIWoS

Detail

ISSN:1882-0778

Fiber-based pulse stretcher for narrowband terahertz pulse generation with a chirped-pulse beating method

Yoshida, Tetsuya;Kamada, Shohei;Murata, Shuhei;Aoki, Takao

APPLIED PHYSICS LETTERS 103(15) 2013-2013

DOIWoS

Detail

ISSN:0003-6951

On the Chirp of Narrowband Terahertz Pulses Generated by Photomixing with Nonlinearly Chirped Laser Pulse Pairs (vol 6, 032701, 2013)

Kamada, Shohei;Murata, Shuhei;Aoki, Takao

APPLIED PHYSICS EXPRESS 7(2) 2014-2014

DOIWoS

Detail

ISSN:1882-0778

High-numerical-aperture microlensed tip on an air-clad optical fiber

Kato, Shinya;Chonan, Sho;Aoki, Takao

OPTICS LETTERS 39(4) p.773 - 7762014-2014

DOIWoS

Detail

ISSN:0146-9592

Guided resonance fluorescence of a single emitter after pulsed excitation

Koshino, Kazuki;Aoki, Takao

PHYSICAL REVIEW A 89(2) 2014-2014

DOIWoS

Detail

ISSN:1050-2947

The chirp-control of frequency-tunable narrowband terahertz pulses by nonlinearly chirped laser pulse beating

Kamada, Shohei;Yoshida, Tetsuya;Aoki, Takao

APPLIED PHYSICS LETTERS 104(10) 2014-2014

DOIWoS

Detail

ISSN:0003-6951

Efficient Single-Mode Photon-Coupling Device Utilizing a Nanofiber Tip

Chonan, Sho;Kato, Shinya;Aoki, Takao

SCIENTIFIC REPORTS 42014-2014

DOIWoS

Detail

ISSN:2045-2322

Elimination of the chirp of narrowband terahertz pulses generated by chirped pulse beating using a tandem grating pair laser pulse stretcher

Yoshida, Tetsuya;Kamada, Shohei;Aoki, Takao

OPTICS EXPRESS 22(19) p.23679 - 236852014-2014

DOIWoS

Detail

ISSN:1094-4087

Ultra-low-loss tapered optical fibers with minimal lengths

Nagai, Ryutaro;Aoki, Takao

OPTICS EXPRESS 22(23) p.28427 - 284362014-2014

DOIWoS

Detail

ISSN:1094-4087

Microtoroidal cavity QED with fiber overcoupling and strong atom-field coupling: A single-atom quantum switch for coherent light fields

Parkins, Scott;Aoki, Takao

PHYSICAL REVIEW A 90(5) 2014-2014

DOIWoS

Detail

ISSN:1050-2947

Time-bin entangled photon pair generation from Si micro-ring resonator

Wakabayashi, Ryota;Fujiwara, Mikio;Yoshino, Ken-ichiro;Nambu, Yoshihiro;Sasaki, Masahide;Aoki, Takao

OPTICS EXPRESS 23(2) p.1103 - 11132015-2015

DOIWoS

Detail

ISSN:1094-4087

Numerical Study on Secrecy Capacity and Code Length Dependence of the Performances in Optical Wiretap Channels

Endo, H.;Han, T. S.;Aoki, T.;Sasaki, M.

IEEE PHOTONICS JOURNAL 7(5) 2015-2015

DOIWoS

Detail

ISSN:1943-0655

Cavity QED with Whispering-Gallery Mode Microresonators

AOKI Takao

41(7) p.497 - 5012013/07-2013/07

CiNii

Detail

ISSN:03870200

Strong Coupling between a Trapped Single Atom and an All-Fiber Cavity

Kato, Shinya; Aoki, Takao

Physical Review Letters 115(9) 2015/08-2015/08

DOIScopus

Detail

ISSN:00319007

Outline:© 2015 American Physical Society.We demonstrate an all-fiber cavity quantum electrodynamics system with a trapped single atom in the strong coupling regime. We use a nanofiber Fabry-Perot cavity, that is, an optical nanofiber sandwiched by two fiber-Bragg-grating mirrors. Measurements of the cavity transmission spectrum with a single atom in a state-insensitive nanofiber trap clearly reveal the vacuum Rabi splitting.

19pBJ-11 Nonlinear optical response of cold atoms via ultra-low-loss optical nanofiber

Senga K.;Matsuhashi Y.;Kato S.;Aoki T.

Meeting Abstracts of the Physical Society of Japan 71(0) 2016-2016

CiNii

Detail

ISSN:2189079X

19pBJ-11 Nonlinear optical response of cold atoms via ultra-low-loss optical nanofiber

Senga K.;Matsuhashi Y.;Kato S.;Aoki T.

Meeting Abstracts of the Physical Society of Japan 71(0) 2016-2016

CiNii

Efficient single-mode photon-coupling device utilizing a nanofiber tip.

Chonan Sho;Kato Shinya;Aoki Takao

Efficient single-mode photon-coupling device utilizing a nanofiber tip. 42014-2014

DOI

Detail

ISSN:2045-2322

Outline::Single-photon sources are important elements in quantum optics and quantum information science. It is crucial that such sources be able to couple photons emitted from a single quantum emitter to a single propagating mode, preferably to the guided mode of a single-mode optical fiber, with high efficiency. Various photonic devices have been successfully demonstrated to efficiently couple photons from an emitter to a single mode of a cavity or a waveguide. However, efficient coupling of these devices to optical fibers is sometimes challenging. Here we show that up to 38% of photons from an emitter can be directly coupled to a single-mode optical fiber by utilizing the flat tip of a silica nanofiber. With the aid of a metallic mirror, the efficiency can be increased to 76%. The use of a silicon waveguide further increases the efficiency to 87%. This simple device can be applied to various quantum emitters.

Numerical Study on Secrecy Capacity and Code Length Dependence of the Performances in Optical Wiretap Channels

Endo, H.; Endo, H.; Han, T. S.; Aoki, T.; Sasaki, M.

IEEE Photonics Journal 7(5) 2015/10-2015/10

DOIScopus

Detail

ISSN:19430655

Outline:© 2015 IEEE. Secrecy issues of free-space optical links realizing information theoretically secure communications and high transmission rates are discussed. We numerically study secrecy communication rates of optical wiretap channel based on on-off keying (OOK) modulation under typical conditions met in satellite-ground links. It is shown that, under reasonable degraded conditions on a wiretapper, information theoretically secure communications should be possible in a much wider distance range than a range limit of quantum key distribution, enabling secure optical links between geostationary Earth orbit satellites and ground stations with currently available technologies. We also provide the upper bounds on the decoding error probability and the leaked information to estimate a necessary code length for given required levels of performances. This result ensures that a reasonable length of wiretap channel code for our proposed scheme must exist.

Time-resolved observation of coherent excitonic nonlinear response with a table-top narrowband THz pulse wave

Uchida, K.; Hirori, H.; Hirori, H.; Aoki, T.; Aoki, T.; Wolpert, C.; Tamaya, T.; Tanaka, K.; Tanaka, K.; Tanaka, K.; Mochizuki, T.; Kim, C.; Yoshita, M.; Akiyama, H.; Pfeiffer, L. N.; West, K. W.

Applied Physics Letters 107(22) 2015/11-2015/11

DOIScopus

Detail

ISSN:00036951

Outline:© 2015 AIP Publishing LLC.By combining a tilted-pulse-intensity-front scheme using a LiNbO3 crystal and a chirped-pulse-beating method, we generated a narrowband intense terahertz (THz) pulse, which had a maximum electric field of more than 10 kV/cm at around 2 THz, a bandwidth of ∼50 GHz, and frequency tunability from 0.5 to 2 THz. By performing THz-pump and near-infrared-probe experiments on GaAs quantum wells, we observed that the resonant excitation of the intraexcitonic 1s-2p transition induces a clear and large Autler-Townes splitting. Our time-resolved measurements show that the splitting energy observed in the rising edge region of electric field is larger than in the constant region. This result implies that the splitting energy depends on the time-averaged THz field over the excitonic dephasing time rather than that at the instant of the exciton creation by a probe pulse.

Free-space optical channel estimation for physical layer security

Endo, Hiroyuki; Endo, Hiroyuki; Fujiwara, Mikio; Kitamura, Mitsuo; Ito, Toshiyuki; Toyoshima, Morio; Takayama, Yoshihisa; Takayama, Yoshihisa; Takenaka, Hideki; Shimizu, Ryosuke; Laurenti, Nicola; Vallone, Giuseppe; Villoresi, Paolo; Aoki, Takao; Sasaki, Masahide

Optics Express 24(8) p.8940 - 89552016/04-2016/04

DOIScopus

Detail

Outline:© 2016 Optical Society of America.We present experimental data on message transmission in a free-space optical (FSO) link at an eye-safe wavelength, using a testbed consisting of one sender and two receiver terminals, where the latter two are a legitimate receiver and an eavesdropper. The testbed allows us to emulate a typical scenario of physical-layer (PHY) security such as satellite-to-ground laser communications. We estimate information-theoretic metrics including secrecy rate, secrecy outage probability, and expected code lengths for given secrecy criteria based on observed channel statistics. We then discuss operation principles of secure message transmission under realistic fading conditions, and provide a guideline on a multi-layer security architecture by combining PHY security and upper-layer (algorithmic) security.

Simple method for fabrication of diamond nanowires by inductively coupled plasma reactive ion etching

Wakui, Kentaro; Yonezu, Yuya; Yonezu, Yuya; Aoki, Takao; Takeoka, Masahiro; Semba, Kouichi

Japanese Journal of Applied Physics 56(5) 2017/05-2017/05

DOIScopus

Detail

ISSN:00214922

Outline:© 2017 The Japan Society of Applied Physics. Diamond nanowires are fabricated on a bulk, single crystalline diamond near an edge of aluminum coating using inductively coupled plasma reactive ion etching. Two different density areas are simultaneously appeared where the dense area has 9 times higher density than that of the sparse area while keeping the size of nanowires almost uniform in these areas. The nanowire sizes realized in the dense (sparse) area are 858 ± 22nm (876 ± 25nm) in height and 126 ± 6 nm (124 ± 7 nm) in diameter, which is suitable for applications in optical quantum information processing.

Efficient Single-Photon Coupling from a Nitrogen-Vacancy Center Embedded in a Diamond Nanowire Utilizing an Optical Nanofiber

Yonezu, Yuya; Yonezu, Yuya; Wakui, Kentaro; Furusawa, Kentaro; Takeoka, Masahiro; Semba, Kouichi; Aoki, Takao

Scientific Reports 7(1) 2017/12-2017/12

DOIScopus

Detail

Outline:© 2017 The Author(s). Nitrogen-Vacancy (NV) centers in diamond are promising solid-state quantum emitters that can be utilized for photonic quantum applications. Various diamond nanophotonic devices have been fabricated for efficient extraction of single photons emitted from NV centers to a single guided mode. However, for constructing scalable quantum networks, further efficient coupling of single photons to a guided mode of a single-mode fiber (SMF) is indispensable and a difficult challenge. Here, we propose a novel efficient hybrid system between an optical nanofiber and a cylindrical-structured diamond nanowire. The maximum coupling efficiency as high as 75% for the sum of both fiber ends is obtained by numerical simulations. The proposed hybrid system will provide a simple and efficient interface between solid-state quantum emitters and a SMF suitable for constructing scalable quantum networks.

Highly efficient coupling photons from single photon source utilizing a nanofiber tip

CHONAN Sho;KATOI Shinya;AOKI Takao

Technical report of IEICE. LQE 113(49) p.31 - 342013/05-2013/05

CiNii

Detail

ISSN:0913-5685

Outline:Efficient coupling of photons from single-photon source to the single-mode fiber is requied for quantum information and cryptography technology. We have performed simulations of photon-collecting devices utilizing a nanofiber tip. Up to 38% of light from point dipole source is coupled to the fundamental guided mode of the nanofiber. These devices utilizing a nanofiber tip are promising to achive efficient single-photon sources.

17aAC-9 Observation of strong coupling between a trapped single Cs atom and a nanofiber-based cavity

Kato Shinya;Aoki Takao

70(2) 2015/09-2015/09

CiNii

Detail

ISSN:2189079X

18pBA-5 Wavelength meter with a sub-pixel resolution using a grating spectrograph II

Kususaki K.;Aoki T.

70(2) 2015/09-2015/09

CiNii

Detail

ISSN:2189079X

Patent

Reference Number:1386

チャープ制御方法及びチャープ制御装置(日本)

青木 隆朗, 鎌田 祥平

2013-019119、2014-149470

Reference Number:1387

集光部(日本)

長南 翔, 青木 隆朗

2013- 42098、2014-170125

Reference Number:1771

量子ゲート装置および量子計算方法(日本)

青木 隆朗

2016-002172、2017-123078

Reference Number:1942

量子もつれ生成装置及び方法(日本)

青木 隆朗

2017-133521、2019-015872

Research Grants & Projects

Grant-in-aids for Scientific Research Adoption Situation

Research Classification:

Waveguide quantum electrodynamics using optical nanofiber

2014/-0-2017/-0

Allocation Class:¥24050000

Research Classification:

Quantum non-demolition measurement with measurement and feed-forward

Allocation Class:¥17290000

Research Classification:

Experimental study on super-dense coding

Allocation Class:¥14800000

Research Classification:

Study on time-domain-multiplexed 2D continuous-variable cluster states and its application to large-scale quantum information processing

2018/-0-2023/-0

Allocation Class:¥635960000

On-campus Research System

Special Research Project

量子光学に適した超高Q値微小旧型光共振器の研究

2011

Research Results Outline:量子光学の実験的研究において、高Q値微小光共振器を用いて光を波長スケールの微小体積中に強く閉じ込めることで、光の量子性が増強され、通常の系では困難な非量子光学の実験的研究において、高Q値微小光共振器を用いて光を波長スケールの微小体積中に強く閉じ込めることで、光の量子性が増強され、通常の系では困難な非古典的光学現象の観測が可能となる。我々は過去の研究において107~108程度の高Q値微小トロイド型...量子光学の実験的研究において、高Q値微小光共振器を用いて光を波長スケールの微小体積中に強く閉じ込めることで、光の量子性が増強され、通常の系では困難な非古典的光学現象の観測が可能となる。我々は過去の研究において107~108程度の高Q値微小トロイド型光共振器を用いてさまざまな非古典的光学現象の観測に成功した。しかし、これらの研究で観測された非古典的光学現象あるいは生成された光の量子状態の量子性は依然として低く、量子通信をはじめとした光学的量子情報への応用には不十分である。そのため、より高いQ値の微小共振器の開発が求められている。上記の研究で用いた微小トロイド型光共振器は、エレクトロニクス用途のシリコン基板上のシリコン酸化膜を材料とするが、低損失光ファイバーを材料とすることでさらにQ値の高い共振器の実現が期待される。そこで本研究では、低損失光ファイバーを材料として微小球型光共振器を作成し、109~1010の超高Q値微小光共振器の実現を目指した。まず、光ファイバーを溶融し、表面張力により真球形状の微小光共振器を作製する技術を開発した。具体的には、被覆を除去しクラッド表面を洗浄した光ファイバーの先端を、CO2レーザーを用いて溶融した。シリカガラスはCO2レーザーの発振波長である中赤外領域に大きな吸収係数を持つため、CO2レーザーの照射によって局所的に加熱することができる。ただしこの方法では、流入熱量は加熱領域の体積に比例するが放射による熱の流出は表面積に比例するため、数μmスケールの微小な体積の高温加熱は困難であることも予想された。しかし、開口数の大きなレンズを用いてレーザーを集光することで、直径数μm程度の極細光ファイバーの先端であっても容易に溶融させることができた。上記の方法で作製した微小球共振器のQ値を周波数領域において測定した。テーパーファイバーを外部導波路として結合した微小球共振器に対して狭線幅の外部共振器型半導体レーザーを入力し、レーザー波長を掃引することで共振スペクトルを測定し、その幅からQ値を得た。結合損失を考慮し、共振器の真性Q値を見積もった結果、1×109を達成した。作製条件の最適化によって、更なるQ値の向上が見込まれる。

ナノ加工ファイバーを用いた単一原子のトラップと量子測定・操作の研究

2014Collaborator:永井隆太郎, 加藤真也

Research Results Outline:ナノ光ファイバーの両端を単一モード光ファイバーと連続的に接続するテーパー部において、基本導波モードと高次導波モードの結合による損失は局所的なファイバーナノ光ファイバーの両端を単一モード光ファイバーと連続的に接続するテーパー部において、基本導波モードと高次導波モードの結合による損失は局所的なファイバー径と各モードの伝搬定数に強く依存する。本研究では、損失を押さえながらも全長を最短にするテーパー形状...ナノ光ファイバーの両端を単一モード光ファイバーと連続的に接続するテーパー部において、基本導波モードと高次導波モードの結合による損失は局所的なファイバー径と各モードの伝搬定数に強く依存する。本研究では、損失を押さえながらも全長を最短にするテーパー形状を設計するとともに、その作製方法を確立した。具体的には、99.7%を超える透過率を持ちながら全長わずか23 mmのナノ光ファイバーの作製に成功した。この結果はOptics Express誌に発表した[R. Nagai and T. Aoki, Opt.Express 22, 28427 (2014)]。今後は、作製した超低損失ナノ光ファイバーを用いた単一原子のレーザー冷却・トラップとその量子測定・操作を目指す。

共振器量子電気力学系の非局所コヒーレント結合の研究

2016

Research Results Outline:共振器量子電気力学系は、光共振器に閉じ込められた光子と、それと相互作用する単一原子からなる系であり、特に強結合領域の共振器量子電気力学系では、光と原子共振器量子電気力学系は、光共振器に閉じ込められた光子と、それと相互作用する単一原子からなる系であり、特に強結合領域の共振器量子電気力学系では、光と原子のコヒーレントな相互作用による様々な量子現象が観測できる。研究代表者らは、ごく最近、ナノ光ファイバ...共振器量子電気力学系は、光共振器に閉じ込められた光子と、それと相互作用する単一原子からなる系であり、特に強結合領域の共振器量子電気力学系では、光と原子のコヒーレントな相互作用による様々な量子現象が観測できる。研究代表者らは、ごく最近、ナノ光ファイバーとファイバーブラッグ格子を組み合わせた新奇な全ファイバー共振器を開発し、トラップされた単一原子と全ファイバー共振器の共振器量子電気力学系を実現した。本研究では、これらの成果をもとに、全ファイバー共振器量子電気力学系を複数独立に構築し、それらをファイバーで直接結合した連結共振器量子電気力学系の実現に向けた予備的な研究を実施した。

微小光共振器を用いた光子の量子非破壊測定の研究

2017

Research Results Outline:本研究では、光ファイバーに直接結合した微小共振器を用いて、光子の量子非破壊測定の実現を目指し、その基盤技術開発を実施した。すなわち、高Q/V値のトロイ本研究では、光ファイバーに直接結合した微小共振器を用いて、光子の量子非破壊測定の実現を目指し、その基盤技術開発を実施した。すなわち、高Q/V値のトロイド型微小光共振器が持つ極めて強い光閉じ込めを利用して単一光子レベルでの巨大非線形光学効果(光カー効...本研究では、光ファイバーに直接結合した微小共振器を用いて、光子の量子非破壊測定の実現を目指し、その基盤技術開発を実施した。すなわち、高Q/V値のトロイド型微小光共振器が持つ極めて強い光閉じ込めを利用して単一光子レベルでの巨大非線形光学効果(光カー効果)を発現させ、信号光の光子数に比例したプローブ光の位相変化を誘起させることで、信号光の光子数とプローブ光の位相の間に量子相関を生じさせ、量子非破壊測定条件の検証を実施するために必要な技術を開発した。

トロイド型微小光共振器を用いた微弱光の相互位相変調の研究

2017

Research Results Outline:我々は、Q値が極めて高く(=損失が低く)、モード体積Vが極めて小さな(=光のエネルギー密度が大きな)トロイド型微小光共振器を開発した。共振器の光カー効我々は、Q値が極めて高く(=損失が低く)、モード体積Vが極めて小さな(=光のエネルギー密度が大きな)トロイド型微小光共振器を開発した。共振器の光カー効果はQ値とモード体積の比(Q/V値)に比例するが、我々の開発したトロイド型微小光共振器はQ/V値が...我々は、Q値が極めて高く(=損失が低く)、モード体積Vが極めて小さな(=光のエネルギー密度が大きな)トロイド型微小光共振器を開発した。共振器の光カー効果はQ値とモード体積の比(Q/V値)に比例するが、我々の開発したトロイド型微小光共振器はQ/V値が極めて高いため、この共振器を用いることで、微弱光による相互位相変調が発現する。本研究では、実際にこの相互位相変調を観測した。

トロイド型微小光共振器を用いた微弱光の相互位相変調の研究

2018

Research Results Outline:我々は、Q値が極めて高く(=損失が低く)、モード体積Vが極めて小さな(=光のエネルギー密度が大きな)トロイド型微小光共振器を継続して開発している。共振我々は、Q値が極めて高く(=損失が低く)、モード体積Vが極めて小さな(=光のエネルギー密度が大きな)トロイド型微小光共振器を継続して開発している。共振器の光カー効果はQ値とモード体積の比(Q/V値)に比例するが、我々の開発したトロイド型微小光共振器...我々は、Q値が極めて高く(=損失が低く)、モード体積Vが極めて小さな(=光のエネルギー密度が大きな)トロイド型微小光共振器を継続して開発している。共振器の光カー効果はQ値とモード体積の比(Q/V値)に比例するが、我々の開発したトロイド型微小光共振器はQ/V値が極めて高いため、この共振器を用いることで、微弱光による相互位相変調が発現する。本研究では、より大きな相互位相変調を実現するため、共振器の作製方法を改良した。

微小光共振器を用いた光子の量子非破壊測定の研究

2018

Research Results Outline:我々は、光ファイバーに直接結合した微小共振器を用いて、光子の量子非破壊測定の実現を目指し、その基盤技術を継続的に開発している。すなわち、高Q/V値のト我々は、光ファイバーに直接結合した微小共振器を用いて、光子の量子非破壊測定の実現を目指し、その基盤技術を継続的に開発している。すなわち、高Q/V値のトロイド型微小光共振器が持つ極めて強い光閉じ込めを利用して単一光子レベルでの巨大非線形光学効果(光カ...我々は、光ファイバーに直接結合した微小共振器を用いて、光子の量子非破壊測定の実現を目指し、その基盤技術を継続的に開発している。すなわち、高Q/V値のトロイド型微小光共振器が持つ極めて強い光閉じ込めを利用して単一光子レベルでの巨大非線形光学効果(光カー効果)を発現させ、信号光の光子数に比例したプローブ光の位相変化を誘起させることで、信号光の光子数とプローブ光の位相の間に量子相関を生じさせ、量子非破壊測定条件の検証を実施するために必要な技術である。本研究では、プローブ光の位相測定におけるノイズの低減に取り組んだ。

Lecture Course

Course TitleSchoolYearTerm
Science and Engineering Laboratory 1A IISchool of Fundamental Science and Engineering2019spring semester
Science and Engineering Laboratory 1A IISchool of Creative Science and Engineering2019spring semester
Science and Engineering Laboratory 1A IISchool of Advanced Science and Engineering2019spring semester
Basic Experiments in Science and Engineering 2B KagakuSchool of Advanced Science and Engineering2019fall semester
Basic Experiments in Science and Engineering 2B SeiiSchool of Advanced Science and Engineering2019fall semester
Introduction to PhysicsSchool of Advanced Science and Engineering2019spring semester
Introduction to PhysicsSchool of Advanced Science and Engineering2019spring semester
Introduction to Physics [S Grade]School of Advanced Science and Engineering2019spring semester
Introduction to Physics [S Grade]School of Advanced Science and Engineering2019spring semester
Applied Physics: Experiment BSchool of Advanced Science and Engineering2019full year
Physics: Experiment BSchool of Advanced Science and Engineering2019full year
Applied Physics: Experiment B [S Grade]School of Advanced Science and Engineering2019full year
Physics: Experiment B [S Grade]School of Advanced Science and Engineering2019full year
Graduation StudySchool of Advanced Science and Engineering2019full year
Graduation Study [S Grade]School of Advanced Science and Engineering2019full year
Graduation StudySchool of Advanced Science and Engineering2019full year
Graduation Study [S Grade]School of Advanced Science and Engineering2019full year
Quantum ElectronicsSchool of Advanced Science and Engineering2019fall semester
Quantum ElectronicsSchool of Advanced Science and Engineering2019fall semester
Optics BSchool of Advanced Science and Engineering2019fall semester
Optics BSchool of Advanced Science and Engineering2019fall semester
Optics ASchool of Advanced Science and Engineering2019spring semester
Optics ASchool of Advanced Science and Engineering2019spring semester
Optics A [S Grade]School of Advanced Science and Engineering2019spring semester
Optics A [S Grade]School of Advanced Science and Engineering2019spring semester
Graduation Thesis A (Physics)School of Advanced Science and Engineering2019fall semester
Graduation Thesis A (Physics) [S Grade]School of Advanced Science and Engineering2019fall semester
Graduation Thesis A (Applied Physics)School of Advanced Science and Engineering2019fall semester
Graduation Thesis A (Applied Physics) [S Grade]School of Advanced Science and Engineering2019fall semester
Graduation Thesis B (Physics)School of Advanced Science and Engineering2019spring semester
Graduation Thesis B (Physics) [S Grade]School of Advanced Science and Engineering2019spring semester
Graduation Thesis B (Applied Physics)School of Advanced Science and Engineering2019spring semester
Graduation Thesis B (Applied Physics) [S Grade]School of Advanced Science and Engineering2019spring semester
Engineering Physics BSchool of Advanced Science and Engineering2019fall semester
Current Topics in PhysicsSchool of Advanced Science and Engineering2019fall semester
Current Topics in PhysicsSchool of Advanced Science and Engineering2019fall semester
Current Topics in PhysicsSchool of Advanced Science and Engineering2019fall semester
Current Topics in Physics [S Grade]School of Advanced Science and Engineering2019fall semester
Master's Thesis (Department of Pure and Applied Physics)Graduate School of Advanced Science and Engineering2019full year
Research on Quantum OpticsGraduate School of Advanced Science and Engineering2019full year
Research on Quantum OpticsGraduate School of Advanced Science and Engineering2019full year
Advanced Quantum OpticsGraduate School of Advanced Science and Engineering2019spring semester
Advanced Quantum OpticsGraduate School of Advanced Science and Engineering2019spring semester
Seminar on Quantum Optics CGraduate School of Advanced Science and Engineering2019spring semester
Seminar on Quantum Optics CGraduate School of Advanced Science and Engineering2019spring semester
Seminar on Quantum Optics DGraduate School of Advanced Science and Engineering2019fall semester
Seminar on Quantum Optics DGraduate School of Advanced Science and Engineering2019fall semester
Master's Thesis (Department of Pure and Applied Physics)Graduate School of Advanced Science and Engineering2019full year
Research on Quantum OpticsGraduate School of Advanced Science and Engineering2019full year
Study Abroad in Physics and Applied Physics AGraduate School of Advanced Science and Engineering2019full year
Study Abroad in Physics and Applied Physics BGraduate School of Advanced Science and Engineering2019full year
Study Abroad in Physics and Applied Physics CGraduate School of Advanced Science and Engineering2019full year
Study Abroad in Physics and Applied Physics DGraduate School of Advanced Science and Engineering2019full year
Research on Physics and Applied Physics B AOKI, TakaoGraduate School of Advanced Science and Engineering2019full year