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Quantum ICT Laboratory

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Introduction

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
QCrypt 2015
The fifth International Conference on Quantum Cryptography
What's New Last Update: 2015.1.20

Recent Topics
▶ "Demonstration of Single-photon Source with 30 Times Higher Speed" - (Dec. 19,2014) «Press Release»
Nature Scientific Reports:doi:10.1038/srep07468
▶ "NICT, BBN, LSU Establish a Fundamental Rate-loss Tradeoff for Optical Quantum Cryptography" - (Oct. 24,2014) «Press Release»
Nature Communications:doi:10.1038/ncomms6235
▶ "New approach to the realization of a long-lived quantum memory for quantum computation
: Observation of a hidden state in a superconductor diamond quantum hybrid system" has been released - (Apr. 8, 2014: NTT Press Release), by Dr. K. Semba, Exsective Researcher, Advanced ICT Research Institute, NICT and others.
http://www.ntt.co.jp/news2014/1404e/140408a.html
Nature Communications:http://www.nature.com/ncomms/2014/140408/ncomms4524/pdf/ncomms4524.pdf
▶Successful Demonstration of Quantum Tele-amplification - Establishing Common Foundation to Long-distance Quantum Cryptography, Low-power High-Capacity Communications - (May 13,2013)) «Press Release»
▶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


Recent Publications
▶"Efficient generation of twin photons at telecom wavelengths with 10 GHz repetition-rate tunable comb laser," Scientific Reports 4, 7468, pp. 7468-1—7468-6, doi:10.1038/srep07468, Dec. (2014).has been added to the list of publications.(2015/1/16)

▶"Reliability and Secrecy Functions of the Wiretap Channel Under Cost Constraint," IEEE Trans. on Inorm. Theory 60(11), pp. 6819—6843, arXiv:1307.0608, doi: 10.1109/TIT.2014.2355811, Nov.(2014).has been added to the list of publications.(2015/1/16)

▶"Efficient detection of a highly bright photon source using superconducting nanowire single photon detectors," Optics Communications 336, pp. 47–54, Web Sept.(2014), Journal Feb. (2015).has been added to the list of publications.(2015/1/16)

▶"Theory of multi-photon pair effects in spontaneous parametric down conversion based quantum information processing," 12th International Conference on Quantum Communication, Measurement, and Computing (QCMC2014), pp. 55—56, Nov., (2014).has been added to the list of publications.(2015/1/16)

▶"Fundamental rate-loss tradeoff for optical quantum key distribution," Nature Communications 5, pp. 5235-1—5235-7, doi:10.1038/ncomms6235, Oct., (2014).has been added to the list of publications.(2015/1/16)

▶"Generation of vacuum ultraviolet radiation by intracavity high-harmonic generation toward state detection of single trapped ions," Appl. Phys. B: Lasers and Optics 117(3), pp. 957—967, DOI:10.1007/s00340-014-5914-y, Sept., (2014).has been added to the list of publications.(2015/1/16)

▶"Squashed Entanglement and the Two-Way Assisted Capacities of a Quantum Channel," IEEE Trans. on Inform. Theory, 60(8), pp. 4987 – 4998, doi:10.1109/TIT.2014.2330313, Aug., (2014).has been added to the list of publications.(2015/1/16)

▶“Capacity of optical communication in loss and noise with general quantum Gaussian receivers,” Proceedings of International Symposium on Information Theory (ISIT) , pp. 2799 – 2803, July, (2014).has been added to the list of publications.(2015/1/16)

▶“Squashed Entanglement and the Two-Way Assisted Capacities of a Quantum Channel,” Proceedings of International Symposium on Information Theory (ISIT) , pp. 326 – 330, June, (2014).has been added to the list of publications.(2015/1/16)

▶“Modified E91 protocol demonstration with hybrid entanglement photon source,” Optics Express 22(11), pp. 13616—13624, June, (2014).has been added to the list of publications.(2015/1/16)

▶“Highly Secure Network Switches with Quantum Key Distribution Systems,” International Journal of Network Security 17(1), pp. 34—39, web May, (2014), Journal Jan., (2015).has been added to the list of publications.(2015/1/16)

▶“Pulsed Sagnac polarization-entangled photon source with a PPKTP crystal at telecom wavelength,” Optics Express 22(10), pp. 11498—11507, DOI:10.1364/OE.22.011498, May, (2014).has been added to the list of publications.(2015/1/16)

▶“Frequency down-conversion of 637 nm light to the telecommunication band for non-classical light emitted from NV centers in diamond,” Optics Express 22(9), pp. 11205—11214, May, (2014).has been added to the list of publications.(2015/1/16)

▶“Long-Time Correlation in Non-Markovian Dephasing ofan Exciton-Phonon System in InAs Quantum Dots,” Phys. Rev. Lett. 112, pp. 147404-1--147404-5, Apr., (2014).has been added to the list of publications.(2015/1/16)

▶"Capacity of optical communication in loss and noise with general quantum Gaussian receivers," Phys. Rev. A 89(4), pp. 042309-1 – 042309-9, Apr., (2014).has been added to the list of publications.(2015/1/16)  

▶"Ultrabroadband direct detection of nonclassical photon statistics at telecom wavelength," Scientific Reports 4(4535), pp. 1—7, Apr., (2014).has been added to the list of publications.(2015/1/16) 

▶"Quantum enigma machines and the locking capacity of a quantum channel," Phys. Rev. X 4(1), pp. 011016-1—011016-23, Jan., (2014).has been added to the list of publications.(2015/1/16)  

▶"Performance of Long-Distance Quantum Key Distribution over 90-km Optical Links Installed in a Field Environment of Tokyo Metropolitan Area," IEEE/OSA Journal of Lightwave Technology 32(1), pp. 141—151, Jan., (2014).has been added to the list of publications.(2015/1/16)

Introduction to Quantum Cryptography and the Tokyo QKD Network

Short version(9min,33MB)

Long version(23min, 79MB)

UQCC Conference Video(37min,70MB)

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Contact Us

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

Quantum ICT Laboratory