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.
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Introduction
R & D Promotion of Quantum Cryptography and Communication
What's New Last
Update: 2017.7.11
| Recent Topics |
| ▶ "World's First Demonstration of Space Quantum Communication Using a Microsatellite" - (Jul. 11,2017) «Press Release» Nature Photonics:doi:10.1038/nphoton.2017.107 ▶ "Highly Efficient Entanglement Swapping and Teleportation at Telecom Wavelength" - (Mar. 26,2015) «Press Release» Nature Scientific Reports:doi:10.1038/srep09333 ▶ "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.
▶Successful Demonstration of Quantum Tele-amplification - Establishing Common Foundation to Long-distance Quantum Cryptography, Low-power High-Capacity Communications - (May 13,2013)) «Press Release»http://www.ntt.co.jp/news2014/1404e/140408a.html Nature Communications:http://www.nature.com/ncomms/2014/140408/ncomms4524/pdf/ncomms4524.pdf ▶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 |
| ▶"Detection-dependent six-photon Holland-Burnett state interference,” Scientific Reports 6, pp. 36914-1—36914-7, Nov. (2016). has been added to the list of publications.(2017/1/17) ▶"Simple method of generating and distributing frequency-entangled qudits,” Quantum Sci. and Tech. 1, pp. 15004-1--15004-9, Nov. (2016). has been added to the list of publications.(2017/1/17) ▶"Error and Secrecy Exponents for Wiretap Channels under Two-Fold Cost Constraints,” IEICE Trans. Fund. Electron., Commun. and Comput. Sci. E99-A(12), pp. 2136 -- 2146, Dec. (2016). has been added to the list of publications.(2017/1/17) ▶"Optical phase estimation via the coherent state and displaced-photon counting,” Phys. Rev. A 92(4), pp. 042328-1-- 042328-11, Sept. (2016). has been added to the list of publications.(2017/1/17) ▶"Experimental transmission of quantum digital signatures over 90-km of installed optical fiber using a differential phase shift quantum key distribution system,” Opt. Lett. 41(21), pp. 4883-4886, Nov. (2016). has been added to the list of publications.(2017/1/17) ▶"Single-photon emission at 1.5 μm from an InAs/InP quantum dot with highly suppressed multi-photon emission probabilities,” Appl. Phys. Lett. 109(13), pp. 132106 -1-- 132106 -4, Sept. (2016). has been added to the list of publications.(2017/1/17) ▶"Unconstrained distillation capacities of a pure-loss bosonic broadcast channel,” Proc. IEEE Int. Symp. Inf. Theory (ISIT) 2016, pp. 2484--2488, July (2016). has been added to the list of publications.(2017/1/17) ▶"On the Throughput Capacity Study for Aloha Mobile Ad Hoc Networks,” IEEE Transactions on Communications Vol. 64, Issue 4, pp. 1646--1659, Apr. (2016). has been added to the list of publications.(2016/6/21) ▶"Bounds on entanglement distillation and secret key agreement for quantum broadcast channels,” IEEE Transactions on Information Theory Vol. 62, Issue 5, pp. 2849--2866, Apr. (2016). has been added to the list of publications.(2016/6/21) ▶"Progress towards practical device-independent quantum key distribution with spontaneous parametric down-conversion sources, on-off photodetectors, and entanglement swapping,” Phys. Rev. A Vol. 93, Issue 4, pp. 042328-1--042328-11, Apr. (2016). has been added to the list of publications.(2016/6/21) ▶"Free-space optical channel estimation for physical layer security,” Optics Express Vol. 24, Issue 8, pp. 8940--8955, Apr. (2016). has been added to the list of publications.(2016/6/21) ▶"Chip-to-chip quantum photonic interconnect by path-polarization interconversion,” Optica, vol.3, no.4, pp. 407--413, Apr. (2016). has been added to the list of publications.(2016/6/21) ▶"Capacity and Delay-Throughput Tradeoff in ICMNs with Poisson Contact Process,” Sringer, Wireless Networks 21(8), pp. 2453 -- 2466, Nov. (2015). has been added to the list of publications.(2016/1/29) ▶"Spectrally resolved Hong-Ou-Mandel interference between independent photon sources,” Optic Express 23(22), pp. 28836-- 28848, Nov. (2015). has been added to the list of publications.(2015/12/24) ▶"Cryogenic Ultra-Low Power Dissipation Operational Amplifiers with GaAs JFETs,” Cryonenics, 73, pp. 8 – 13, Dec.(2015). has been added to the list of publications.(2015/12/24) ▶"Sideband cooling of a Ca+–In+ ion chain toward the quantum logic spectroscopy of In+,” Appl. Phys. B, 121(2), pp. 147 – 153, Nov. (2015). has been added to the list of publications.(2015/12/24) ▶"Mode-hop-free operation of a distributed Bragg reflector diode laser in an external fiber-cavity configuration,” Applied Physics B, 121(2), pp. 213 – 219, Nov. (2015). has been added to the list of publications.(2015/12/24) ▶"Numerical Study on Secrecy Capacity and Code Length Dependence of the Performances in Optical Wiretap Channels,” IEEE Photonics J., 7(5), pp. 7903418-1—7903418-11, Oct. (2015). has been added to the list of publications.(2015/12/24) ▶"Time-resolved measurements of Cooper-pair radiative recombination in InAs quantum dots,” JJAP Journal of Applied Physics 118,pp.073102-1--073102-7 Aug. (2015). has been added to the list of publications.(2015/12/24) |
Introduction to Quantum Cryptography and the Tokyo QKD Network
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