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Author |
Shcherbatenko, M. L.; Elezov, M. S.; Goltsman, G. N.; Sych, D. V. |
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Title |
Sub-shot-noise-limited fiber-optic quantum receiver |
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Journal Article |
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Year |
2020 |
Publication |
Phys. Rev. A |
Abbreviated Journal |
Phys. Rev. A |
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Volume |
101 |
Issue |
3 |
Pages |
032306 (1 to 5) |
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Keywords |
SSPD mixer, SNSPD |
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Abstract |
We experimentally demonstrate a quantum receiver based on the Kennedy scheme for discrimination between two phase-modulated weak coherent states. The receiver is assembled entirely from standard fiber-optic elements and operates at a conventional telecom wavelength of 1.55 μm. The local oscillator and the signal are transmitted through different optical fibers, and the displaced signal is measured with a high-efficiency superconducting nanowire single-photon detector. We show the discrimination error rate is two times below that of a shot-noise-limited receiver with the same system detection efficiency. |
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2469-9926 |
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1268 |
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Author |
Venediktov, I. O.; Elezov, M. S.; Prokhodtsov, A. I.; Kovalyuk, V. V.; An, P. P.; Golikov, A. D.; Shcherbatenko, M. L.; Sych, D. V.; Goltsman, G. N. |
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Title |
Study of microheater’s phase modulation for on-chip Kennedy receiver |
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Conference Article |
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Year |
2020 |
Publication |
J. Phys.: Conf. Ser. |
Abbreviated Journal |
J. Phys.: Conf. Ser. |
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Volume |
1695 |
Issue |
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Pages |
012117 |
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Keywords |
Mach-Zehnder interferometers, MZI |
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In this work we describe phase modulators for several Mach-Zehnder interferometers (MZI) on silicon nitride platform for telecomm wavelength (1550 nm). We obtained current-voltage and phase-voltage curves for these modulators. MZI are needed for experimental realisation of various quantum receivers that can distinguish weak coherent states of light with extremely low error. Thermo-optical (TO) modulation is ensured by microheaters on one of the arms of MZI, which enables the change of the refractive index of the material with temperature. This approach allows to apply the necessary voltage to the golden microheaters to obtain the required phase change. For the on-chip microheaters we demonstrate the dependence of the phase shift on the voltage applied to our on-chip microheaters. |
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1742-6588 |
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1179 |
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Author |
Elezov, M. S.; Semenov, A. V.; An, P. P.; Tarkhov, M. A.; Goltsman, G. N.; Kardakova, A. I.; Kazakov, A. Y. |
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Title |
Investigating the detection regimes of a superconducting single-photon detector |
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Journal Article |
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Year |
2013 |
Publication |
J. Opt. Technol. |
Abbreviated Journal |
J. Opt. Technol. |
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Volume |
80 |
Issue |
7 |
Pages |
435 |
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Keywords |
SSPD, quantum efficiency |
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The detection regimes of a superconducting single-photon detector have been investigated. A technique is proposed for determining the regions in which “pure regimes” predominate. Based on experimental data, the dependences of the internal quantum efficiency on the bias current are determined in the one-, two-, and three-photon detection regimes. |
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1070-9762 |
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1172 |
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Elezov, M. S.; Ozhegov, R. V.; Goltsman, G. N.; Makarov, V.; Vinogradov, E. A.; Naumov, A. V.; Gladush, M. G.; Karimullin, K. R. |
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Title |
Development of the experimental setup for investigation of latching of superconducting single-photon detector caused by blinding attack on the quantum key distribution system |
Type |
Conference Article |
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Year |
2017 |
Publication |
EPJ Web Conf. |
Abbreviated Journal |
EPJ Web Conf. |
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Volume |
132 |
Issue |
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Pages |
01004 (1 to 2) |
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Keywords |
QKD, SSPD, SNSPD |
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Recently bright-light control of the SSPD has been demonstrated. This attack employed a “backdoor” in the detector biasing scheme. Under bright-light illumination, SSPD becomes resistive and remains “latched” in the resistive state even when the light is switched off. While the SSPD is latched, Eve can simulate SSPD single-photon response by sending strong light pulses, thus deceiving Bob. We developed the experimental setup for investigation of a dependence on latching threshold of SSPD on optical pulse length and peak power. By knowing latching threshold it is possible to understand essential requirements for development countermeasures against blinding attack on quantum key distribution system with SSPDs. |
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2100-014X |
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1327 |
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Elezov, M. S.; Ozhegov, R. V.; Goltsman, G. N.; Makarov, V. |
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Title |
Development of the experimental setup for investigation of latching of superconducting single-photon detector caused by blinding attack on the quantum key distribution system |
Type |
Conference Article |
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Year |
2017 |
Publication |
EPJ Web of Conferences |
Abbreviated Journal |
EPJ Web of Conferences |
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Volume |
132 |
Issue |
2 |
Pages |
2 |
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Abstract |
Recently bright-light control of the SSPD has been
demonstrated. This attack employed a “backdoor†in the detector biasing
scheme. Under bright-light illumination, SSPD becomes resistive and
remains “latched†in the resistive state even when the light is switched off.
While the SSPD is latched, Eve can simulate SSPD single-photon response
by sending strong light pulses, thus deceiving Bob. We developed the
experimental setup for investigation of a dependence on latching threshold
of SSPD on optical pulse length and peak power. By knowing latching
threshold it is possible to understand essential requirements for
development countermeasures against blinding attack on quantum key
distribution system with SSPDs. |
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RPLAB @ kovalyuk @ |
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1116 |
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Author |
Elezov, M. S.; Shcherbatenko, M. L.; Sych, D. V.; Goltsman, G. N. |
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Title |
Development of control method for an optimal quantum receiver |
Type |
Conference Article |
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Year |
2020 |
Publication |
J. Phys.: Conf. Ser. |
Abbreviated Journal |
J. Phys.: Conf. Ser. |
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Volume |
1695 |
Issue |
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Pages |
012126 |
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Keywords |
Helstrom bound, SPD, single photon detector, below quantum limit |
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We propose a method for optimal displacement controlling of an optimal quantum receiver for registrations a binary coherent signal. An optimal receiver is able to distinguish between two phase-modulated states of a coherent signal. The optimal receiver controlling method can be used later in practice in various physical implementations of the optimal receiver. |
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1742-6588 |
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1264 |
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Elezov, M. S.; Ozhegov, R. V.; Kurochkin, Y. V.; Goltsman, G. N.; Makarov, V. S.; Samartsev, V. V.; Vinogradov, E. A.; Naumov, A. V.; Karimullin, K. R. |
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Title |
Countermeasures against blinding attack on superconducting nanowire detectors for QKD |
Type |
Conference Article |
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Year |
2015 |
Publication |
EPJ Web Conf. |
Abbreviated Journal |
EPJ Web Conf. |
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Volume |
103 |
Issue |
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10002 (1 to 2) |
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Keywords |
SSPD, SNSPD, QKD |
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Abstract |
Nowadays, the superconducting single-photon detectors (SSPDs) are used in Quantum Key Distribution (QKD) instead of single-photon avalanche photodiodes. Recently bright-light control of the SSPD has been demonstrated. This attack employed a “backdoor” in the detector biasing technique. We developed the autoreset system which returns the SSPD to superconducting state when it is latched. We investigate latched state of the SSPD and define limit conditions for effective blinding attack. Peculiarity of the blinding attack is a long nonsingle photon response of the SSPD. It is much longer than usual single photon response. Besides, we need follow up response duration of the SSPD. These countermeasures allow us to prevent blind attack on SSPDs for Quantum Key Distribution. |
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2100-014X |
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1352 |
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Author |
Elezov, M. S.; Scherbatenko, M. L.; Sych, D. V.; Goltsman, G. N. |
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Title |
Active and passive phase stabilization for the all-fiber Michelson interferometer |
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Conference Article |
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2018 |
Publication |
J. Phys.: Conf. Ser. |
Abbreviated Journal |
J. Phys.: Conf. Ser. |
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Volume |
1124 |
Issue |
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Pages |
051014 (1 to 5) |
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Keywords |
Michelson interferometer, phase stabilization |
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We put forward two methods for phase stabilization in the all-fiber Michelson interferometer. To perform passive phase stabilization, we use a heat bath for all fibers and electro-optical components, and put the interferometer in a hermetic case. To perform active phase stabilization, we monitor output power of the interferometer and develop an electronic feedback control. The phase stabilization methods enable stable interference pattern for several minutes, and can be helpful for the development of the optimal quantum receiver for coherent signals. |
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1742-6588 |
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1299 |
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