aqora

Coherent detection schemes for subcarrier wave continuous variable quantum key distribution

E.O. Samsonov, R. Goncharov, M.A. Fadeev +5 more

We examine different methods to implement coherent detection in subcarrier wave quantum key distribution (SCW QKD) systems. For classical wave fields, we present the models describing homodyne-type and heterodyne-type coherent detection schemes needed to extract information from the quadrature phase-coded multimode signals used in SCW QKD. Practical feasibility of the proposed schemes is corroborated by experiments.

arXiv:2006.16543Journal of the Optical Society of America BJun 11, 202116 citations

HETERODYNE DETECTION FOR SUBCARRIER-WAVE QUANTUM KEY DISTRIBUTION SYSTEM

Михаил Арсеньевич Фадеев, P. A. Morozova, Semyon V. Smirnov +3 more

Radiophysics and Quantum ElectronicsSep 1, 20240 citations

Heterodyne detection method of multimode states for subcarrier wave continuous variable quantum key distribution

I. M. Filipov, R. Goncharov, Michael V. Dashkov +4 more

A novel coherent detection method for subcarrier wave (SCW) quantum states applied to continuousvariable quantum key distribution (CV-QKD) is presented. The proposed approach relies on repeated phase modulation at the receiver and spatial separation of the carrier and subcarrier frequency components. The resulting output is an intermediate frequency determined by the difference between the sender’s and receiver’s modulation frequencies. An analytical model of the detection output is developed through time-varying modulation using a classical method based on Bessel functions, and a comparative analysis with alternative heterodyne detection methods is provided. Experimental validation confirms the linear dependence of the output signal on the receiver’s modulation frequency and the sender’s modulation index in the small-modulation regime. Furthermore, the feasibility of the proposed method is demonstrated through the detection of discretely modulated signals using quadrature phase-shift keying (QPSK).A novel coherent detection method for subcarrier wave (SCW) quantum states applied to continuousvariable quantum key distribution (CV-QKD) is presented. The proposed approach relies on repeated phase modulation at the receiver and spatial separation of the carrier and subcarrier frequency components. The resulting output is an intermediate frequency determined by the difference between the sender’s and receiver’s modulation frequencies. An analytical model of the detection output is developed through time-varying modulation using a classical method based on Bessel functions, and a comparative analysis with alternative heterodyne detection methods is provided. Experimental validation confirms the linear dependence of the output signal on the receiver’s modulation frequency and the sender’s modulation index in the small-modulation regime. Furthermore, the feasibility of the proposed method is demonstrated through the detection of discretely modulated signals using quadrature phase-shift keying (QPSK).

Nanosystems Physics Chemistry MathematicsJan 6, 20260 citations

Source-Manipulating Wavelength-Dependent Continuous-Variable Quantum Key Distribution with Heterodyne Detectors

Geli Lv, Dazu Huang, Ying Guo

International Journal of Theoretical PhysicsDec 9, 20150 citations

Subcarrier wave continuous-variable quantum key distribution with Gaussian modulation: composable security analysis

R. Goncharov, Alexei D. Kiselev, E.O. Samsonov +1 more

In this paper, we continue the study of the quantum cryptographic GG02 protocol, performed using the approach based on the subcarrier waves. We modify the scheme via heterodyne detection and perform security analysis for the full trusted hardware noise model in the presence of collective attacks with finite-key effects. It is shown that the system can potentially distribute the key even if the level of losses in the channel is above 9 dB. This result is consistent with the general technical level and comply with modern standards of practical CV-QKD systems. Finally, the system under consideration fully meets the criterion of composability.In this paper, we continue the study of the quantum cryptographic GG02 protocol, performed using the approach based on the subcarrier waves. We modify the scheme via heterodyne detection and perform security analysis for the full trusted hardware noise model in the presence of collective attacks with finite-key effects. It is shown that the system can potentially distribute the key even if the level of losses in the channel is above 9 dB. This result is consistent with the general technical level and comply with modern standards of practical CV-QKD systems. Finally, the system under consideration fully meets the criterion of composability.

Computer OpticsApr 24, 202310 citations

Quantum Statistics of Homodyne and Heterodyne Detection

Horace P. Yuen, Jeffrey H. Shapiro

Springer eBooksJan 1, 197827 citations

Heterodyne Detection for a Subcarrier Wave Quantum Key Distribution System

Related papers

Heterodyne Detection for a Subcarrier Wave Quantum Key Distribution System

Related papers