Secure polarization-independent subcarrier quantum key distribution in optical fiber channel using BB84 protocol with a strong reference

Gleim, A.V.; Egorov, V. I.; Nazarov, Yu. V.; Smirnov, S. V.; Chistyakov, V. V.; Bannik, O. I.; Анисимов, А. Н.; Kynev, S. M.; Ivanova, A. E.; Collins, Robert J.; Kozlov, S. A.; Buller, Gerald S.

doi:10.1364/oe.24.002619

Cited by 98 publications

(75 citation statements)

References 33 publications

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“…Although this system used a DPS-QKD demonstrator as the underlying optical system, there is no reason to believe that the performance of a phase-encoded BB84 type system would be significantly different in terms of time to sign bits at these levels of channel loss. By demonstrating that QDS protocols can be applied to an alternative QKD protocol, other than BB84, this work has shown that there is scope for use of QDS with further alternative QKD systems such as coherent-one-way 38 or sub-carrier wave 39 . With revised protocols for signatures offering the possibility of even greater enhancements in signature generation rate 40 , the prospect of commercial systems capable of offering both QKD and QDS, depending on the end application required, is potentially close and recent developments in chip scale QKD systems 41 also offer the prospect of compact chip scale QDS systems.…”

Section: Resultsmentioning

confidence: 92%

Experimental demonstration of quantum digital signatures over 43 dB channel loss using differential phase shift quantum key distribution

Collins

Amiri

Fujiwara

et al. 2017

Sci Rep

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Ensuring the integrity and transferability of digital messages is an important challenge in modern communications. Although purely mathematical approaches exist, they usually rely on the computational complexity of certain functions, in which case there is no guarantee of long-term security. Alternatively, quantum digital signatures offer security guaranteed by the physical laws of quantum mechanics. Prior experimental demonstrations of quantum digital signatures in optical fiber have typically been limited to operation over short distances and/or operated in a laboratory environment. Here we report the experimental transmission of quantum digital signatures over channel losses of up to 42.8 ± 1.2 dB in a link comprised of 90 km of installed fiber with additional optical attenuation introduced to simulate longer distances. The channel loss of 42.8 ± 1.2 dB corresponds to an equivalent distance of 134.2 ± 3.8 km and this represents the longest effective distance and highest channel loss that quantum digital signatures have been shown to operate over to date. Our theoretical model indicates that this represents close to the maximum possible channel attenuation for this quantum digital signature protocol, defined as the loss for which the signal rate is comparable to the dark count rate of the detectors.

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Section: Resultsmentioning

confidence: 92%

Experimental demonstration of quantum digital signatures over 43 dB channel loss using differential phase shift quantum key distribution

Collins

Amiri

Fujiwara

et al. 2017

Sci Rep

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“…The parameters of the signal field are determined by the requirements of the protocol of quantum communication. Encoding in a QCSF system with homodyne detection can be done via quadrature modulation of the radio frequency control signal, and is also determined by a protocol [9].…”

Section: Using a Heterodyne Detection Scheme In A Subcarrier Wave Quamentioning

confidence: 99%

Using a Heterodyne Detection Scheme in a Subcarrier Wave Quantum Communication System

Mel’nik

Arslanov

Bannik

et al. 2018

Bull. Russ. Acad. Sci. Phys.

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INTRODUCTIONQuantum networks [1] designed for transferring quantum information to large numbers of users in order to organize safe communication or data exchange between quantum computing machines are now being developed. The typical speeds of quantum bit generation in quantum networks remain relatively slow (no greater than 1-2 Mbit ⋅ s −1 ) [2]. This is mainly due to the low efficiency of detection blocks. Most quantum communication schemes include different kinds of photon detectors for registering quantum states. Photon detectors based on avalanche-type light-emitting diodes are characterized by relatively high levels of dark operations (around 1-10 kHz), and in practical terms have limited registering speeds, due to the need to compensate for the effect of afterpulsing. Superconducting detectors [3] have high quantum efficiency (up to 80% for a wavelength of 1.5 μm), low jitter (100 ps), slow dark counts (around 10 Hz), and are able to determine the number of photons in a count [4]. To ensure their functioning, however, we must cool the sensitive element to temperatures of ~2.5 K. In addition, using devices for counting single photons in quantum communication systems imposes substantial restrictions on their application upon the spectral multiplexing of a quantum channel together with classic information channels.In addition to schemes that use counts of single photons for registering single-photon qubits, there is an alternative approach known as the system of quantum communication on continuous variables, which has been under development for the last decade [5,6]. Here, the quantum states of photon qubits is measured via homodyne detection by mixing the local oscillator field with signal radiation, which carries information about the state of photon qubits. An advantage of this approach is high count speed and the simple design of the detector.The authors of [7] proposed the scheme of quantum communication on side frequencies (QCSF). A distinguishing feature of the QCSF system compared to other schemes is its way of generating and encoding single-photon states. Single photons are not irradiated directly by a source, but are carried to the side frequencies of spectrum as a result of phase modulation by the radio frequency signal of intense singlefrequency laser irradiation. At the same time, the phase of the modulating signal determines the phase shift between radiation on the central and side frequencies, allowing us to implement protocols of quantum communication B92 [8], BB84 [9], and so on. Due to the selected shape of the optical signal scheme, QCSF has considerable advantages in creating quantum networks based on the existing infrastructure of optical communication. These include stability against the effects external conditions have on the parameters of signal photons, unidirectionality of the optical scheme, and higher spectral efficiency [10].This work proposes an optical scheme QCSF with heterodyne signal detection, which in the future will allow us to build a protocol of quantum communication on ...

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“…Thereby, the problem of system synchronization is reduced to fine tuning of the transmitter and receiver oscillators. Detailed descriptions of phase modulating in a SCWQC system are provided in [8,9].…”

Section: Process Modelingmentioning

confidence: 99%

“…The Ω value is typically several gigahertz for SCWQC systems [3,8]; we used a value of 4 GHz in our calculations. Therefore, the maximum tolerable synchronization signal time delay is 1.7 ps.…”

Section: Process Modelingmentioning

confidence: 99%

Synchronization signal distortion in quantum communication systems

Dubrovskaia¹,

Chivilikhin²

2017

Nanosystems: Phys. Chem. Math.

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An important problem in the practical implementation of fiber optical quantum communication systems is to synchronize the sender and receiver modules using a separate optical channel. The signal visibility in the quantum channel, which contributes to quantum bit error rate, is influenced by the synchronization signal delay. In this work, we investigate the dependence of the synchronization signal parameters on the dispersive effects in the fiber for a subcarrier wave quantum communication system (SCWQC), which is promising for quantum networking applications. The ITU-T G.652D standard single mode optical fiber was used for modeling. The maximum calculated phase mismatch of the synchronization signal for the system operating at 100 km fiber length corresponds to 1.7 ps signal time delay. The results show that dispersion causes significant signal distortion, therefore additional phase adjustment at least every 2.3 hours is required for stable system operation.

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Secure polarization-independent subcarrier quantum key distribution in optical fiber channel using BB84 protocol with a strong reference

Cited by 98 publications

References 33 publications

Experimental demonstration of quantum digital signatures over 43 dB channel loss using differential phase shift quantum key distribution

Experimental demonstration of quantum digital signatures over 43 dB channel loss using differential phase shift quantum key distribution

Using a Heterodyne Detection Scheme in a Subcarrier Wave Quantum Communication System

Synchronization signal distortion in quantum communication systems

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