Quantum ICT Laboratory Home

We are investigating communications technology of the future, so-called quantum info-communications, which directly controls the quantum mechanical properties of photons and electrons. The world of quantum mechanics promises a number of significant advances that are beyond the capabilities of conventional info-communications technologies. For example, it is possible to increase the reliability of information transmitted even at single-photon level by using a coding scheme that controls the quantum states of light. We aim at exploring theories to treat information in quantum mechanics properly, to develop basic technologies for controlling the quantum states of photons, and to realize as many dreams as possible for our future society.

Promoting R & D on quantum cryptography and communications

Introduction to Quantum Cryptography and the Tokyo QKD Network

Short version
(9min,33MB)

Long version
(23min, 79MB)

UQCC Conference Video
(37min,70MB)

DVD is also now available

A high-resolution video is also now available free of charge on DVD for the purpose of public education and research promotion. If you are interested, please apply for the DVD by filling out the contact form below. Your personal information is only used for mailing purposes and will not be shared with or sold to third parties.

Contact point for further inquiries : information "At" nict.go.jp
* Please change "At" to " @".

Terms and Conditions of Use

The video material made available on this website is owned by NICT and protected by Copyright. Unless otherwise stated, no part of this video may be reproduced or used for any purpose other than private personal use without the prior written consent of the NICT. Any unauthorized copying, publication or reproduction of the content of this video for dissemination of either commercial or non-commercial nature constitutes an infringement of the copyright and is strictly prohibited.

Recent Topics

Bit error rate bound of optical communication theory was beaten - An important step toward ultra-long-distance, low-power and high-capacity communications - (Jun 28, 2011) «Press Release»

Satellite Conference will be held on October 21-22 at NII, Tokyo, Japan.
http://www.qis.ex.nii.ac.jp/icqit2010/index.html

International Conference be held on 18th to 20th of October in ANA InterContinental Hotel in Tokyo, Japan.
http://www.uqcc2010.org/

Performance of hybrid entanglement photon pair source for quantum key distribution　(Feb 3, 2010)
---For more information, please visit our website at Performance of hybrid entanglement-20100204.pdf

2010 International Symposium on Physics of Quantum Technology (2010 ISPQT) will be held in Tokyo, Japan.
http://www.2010ispqt.org/
2010 Simposium Poster

"Longest and fastest quantum key distribution in an installed fiber network," (Mar 26, 2008).
--- Advancement toward realizing cryptographic key distribution with the ultimate information security ---
For more information, please visit our website at http://qict.nict.go.jp/topics/topics001_eng.html

Recent Update

In Publications, some articles are linked to the abstract of the journal web page.

"Countermeasure against tailored bright illumination attack for DPS-QKD," Opt. Express 21(3), pp. 2667--2673 (2013).has been added to the list of publications.(2013/1/29)

"High-fidelity conversion of photonic quantum information to telecommunication wavelength with superconducting single-photon detectors," Phys. Rev. A 87(1), pp. 010301/1--4 (2013).has been added to the list of publications.(2013/1/29)

"Anisotropic optical properties of excitons in strain-controlled InAs quantum dots," Phys. Rev. B 87, pp. 035304/1--10 (2013).has been added to the list of publications.(2013/1/16)

"Verification Plan of Basic Quantum Key Distribution Experiments by Using a Small Satellite," Trans. JSASS Aerospace Tech. Japan, 10(ists28), pp. Pj_9--Pj_15 (2012).has been added to the list of publications.(2013/1/16)

"Stability of high bit rate quantum key distribution on installed fiber," Opt. Express. 20(15), pp. 16339--16347 (2012).has been added to the list of publications.(2013/1/16)

"Quadrature phase shift keying coherent state discrimination via a hybrid receiver," New J. Phys. 14, pp. 083009/1--13 (2012).has been added to the list of publications.(2012/12/6)

"Displacement receiver for phase-shift-keyed coherent states," Phys. Rev. A 86(4), pp. 042328/1--11 (2012).has been added to the list of publications.(2012/11/29)

"Silver Embedded Nanomesas as Enhanced Single Quantum Dot Emitters in the Telecommunication C Band," Japanese Journal of Applied Physics, 51, pp. 06FF12-1--5 (2012).has been added to the list of publications.(2012/6/27)

"High-Speed Quantum Key Distribution System for 1-Mbps Real-Time Key Generation," IEEE J. Quantum Electron. 48(4). pp.542--550 (2012).has been added to the list of publications.(2012/6/4)

"Inter-dot coupling and excitation transfer mechanisms of telecommunication band InAs quantum dots at elevated temperatures," New J. Phys. 14, pp. 023037/1--19 (2012).has been added to the list of publications.(2012/04/20)

"The Cryogenic Multi-Channel Readout System for Submillimeter/Terahertz Cameras," J. Low Temp. Phys., 10.1007/s(10909-012-0595-6), pp. 1--5 (2012).has been added to the list of publications.(2012/4/17)

"Synthesis of two-species ion chains for a new optical frequency standard with an indium ion," Appl. Phys. B, 10.1007/s(00340-012-4909-9), pp. 1--6 (2012).has been added to the list of publications.(2012/4/17)

"Origin of intrinsic dark count in superconducting nanowire single-photon detectors," Appl. Phys. Lett. 99(16), pp. 161105/1--3 (2011).has been added to the list of publications.(2012/2/1)

"Efficient and low-noise single-photon avalanche photodiode for 1.244-GHz clocked quantum key distribution," Opt. Express. 19(21), pp. 20531 -- 20541 (2011).has been added to the list of publications.(2012/2/1)

"Efficient homodyne measurement of picosecond squeezed pulses with pulse shaping technique," Opt. Lett. 36(23), pp. 4653--4655 (2011).has been added to the list of publications.(2012/2/1)

"High-speed wavelength-division multiplexing quantum key distribution system," Opt. Lett. 37(2), pp. 223--225 (2012).has been added to the list of publications.(2012/1/31)

"Fabrication of Metal Embedded Nano-Cones for Single Quantum Dot Emission," Jpn. J. Appl. Phys. 50, pp 06GG02/1--5 (2011).has been added to the list of publications.(2011/7/26)

"Quantum Receiver beyond the Standard Quantum Limit of Coherent Optical Communication," Phys. Rev. Lett. 106(25), pp 250503/1--4 (2011).has been added to the list of publications.(2011/7/20)

"Modulation-free optical locking of an external-cavity diode laser to a filter cavity," Opt. Lett. 36(12), pp. 2188--2190 (2011).has been added to the list of publications.(2011/6/21)

"Polarization-Basis Tracking Scheme in Satellite Quantum Key Distribution," Int. J. Opt. 2011, pp. 1--8 (2011).has been added to the list of publications.(2011/6/21)

"Bridging discrete and continuous variables in quantum information," Opt. Photo. News. 21(12), pp 46 (2010).has been added to the list of publications.(2011/6/10)

"Field test of quantum key distribution in the Tokyo QKD Network," Opt. Express 19(11), pp. 10387--10409 (2011).has been added to the list of publications.(2011/6/10)

"Engineering of optical continuous-variable qubits via displaced photonsubtraction: multimode analysis," J. Mod. Opt. 58(3), pp. 266--275 (2011).has been added to the list of publications.(2011/6/10)

"Photon subtraction from traveling fields - recent experimental applications," Progress in Informatics 8, pp. 5--18 (2011).has been added to the list of publications.(2011/6/10)

"Multicasting Multiple Correlated Sources to Multiple Sinks Over a Noisy Channel Network," IEEE Trans. Information Theory 57(1), pp. 4--13 (2011).has been added to the list of publications.(2011/6/10)

"Enhancing Detection Efficiency by Applying an Optical Cavity Structure in a Superconducting Nanowire Single-Photon Detector,"(Invited paper), IEICE TRANS. ELECTRON. E94-C(3), pp260--265(2011).has been added to the list of publications.(2011/3/23)

"Invariance of the bit error rate in the ancilla-assisted homodyne detection," Phys. Rev. A 82(5), pp 052303/1--4 (2010).has been added to the list of publications.(2011/3/23)

"Demonstration of Coherent-State Discrimination Using a Displacement-Controlled Photon-Number-Resolving Detector," Phys. Rev. Lett. 104, pp 100505/1--4 (2010).has been added to the list of publications.(2010/5/21)

"Photon level crosstalk between parallel fibers installed in urban area," Opt. Express. 18(21), pp 22199 --22207 (2010).has been added to the list of publications.(2010/11/12)

"Temperature dependent performances of superconducting nanowire single-photon detectors in an ultralow-temperature region," Appl. Phys. Express 3(10), pp 102502/1--3 (2010).has been added to the list of publications.(2010/11/12)

"Ultra-high-sensitivity single-photon detection with a linear-mode silicon avalanche photodiode," Opt. Lett. 35(15), pp 2621--2623 (2010).has been added to the list of publications.(2010/11/12)

"Optical continuous-variable qubit," Phys. Rev. Lett. 105, pp 053602/1--4 (2010).has been added to the list of publications.(2010/11/12)

"Discrimination of binary coherent states using a homodyne detector and a photon number resolving detector," Phys. Rev. A 81(6), pp 062338/1--11 (2010).has been added to the list of publications.(2010/11/12)

"Multi-channel SNSPD system with high detection efficiency at telecommunication wavelength," Opt. Lett. 35 (13), pp 2133--2135 (2010).has been added to the list of publications.(2010/11/12)

"Operating quantum waveguide circuits with superconducting single-photon detectors," Appl. Phys. Lett. 96(21), pp 211101/1--3 (2010).has been added to the list of publications.(2010/11/12)

"Sub-shot-noise-limit discrimination of on-off keyed coherent signals via a quantum receiver with a superconducting transition edge sensor," Opt. Express. 18(8), pp 8107--8114 (2010).has been added to the list of publications.(2010/11/12)

"Optical continuous-variable qubit," Phys. Rev. Lett. 105, pp. 053602/1-4(2010)

"Quantum detection of wavelength-division-multiplexing optical coherent signals," J. Opt. Soc. Am. B, 27(2), pp 259--265 (2010).has been added to the list of publications.(2010/5/21)

"Cut-off rate analysis of practical quantum receivers," J. Mod. Opt. 57 (3), pp 207--212 (2010).has been added to the list of publications.(2010/5/21)

"Entanglement distillation from Gaussian input states," Nat. Photonics 4, pp 178--181 (2010).has been added to the list of publications.(2010/5/21)

"The Cryogenic Digital Readout Module with GaAs JFET Ics," Conference proceeding of 13th lnternational workshop on low temperature detectors LTD13, 1185, pp 290--293 (2010), has been added to the list of publications.(2010/2/10)

"Cryogenic Low Noise Amplifier with GaAs JFETs," Conference proceeding of 13th lnternational workshop on low temperature detectors LTD13, 1185, pp 267--270 (2010), has been added to the list of publications.(2010/2/10)

"Development of cryogenic analog amplifiers based on GaAs-JFET technology for high impedance array sensors," Conference proceeding of 13th lnternational workshop on low temperature detectors LTD13, 1185, pp 115--118 (2010), has been added to the list of publications.(2010/2/10)

"Superconducting THz Camera with GaAs-JFET Cryogenic Readout Electronics," Conference proceeding of 13th lnternational workshop on low temperature detectors LTD13, 1185, pp 393--396 (2010), has been added to the list of publications.(2010/2/10)

National Institute of Information and Communications Technology, Advanced ICT Research Institute, Quantum ICT Laboratory. / Director, Masahide Sasaki
4-2-1 Nukui-Kitamachi, Koganei, Tokyo 184-8795 Japan / TEL:

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* New group name: Quantum ICT Laboratory (former Quantum ICT Group)