Simple and Efficient Detection Scheme for Continuous Variable Quantum Key Distribution with m-ary Phase-Shift-Keying

Kleis, Sebastian; Herschel, Reinhold; Schaeffer, Christian

doi:10.1364/cleo_si.2015.sw3m.7

Cited by 5 publications

(5 citation statements)

References 2 publications

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“…Therefore, it is highly preferable that CV-QKD systems work with a real LO generated by a separate laser source at the receiver site (Bob). Since 2015, various real LO systems have been proposed and experimentally demonstrated [8][9][10][11][12][13][14][15][16][17]. In all the proposed systems, carrier phase estimation is based on auxiliary signals, also called pilots, that are generated at the transmitter site (Alice).…”

Section: Introductionmentioning

confidence: 99%

“…For example, the system in [16] uses only one polarization for the quantum signal and the orthogonal one for a pilot tone. In [8], two pilot tones are multiplexed with the quantum signal in the frequency domain and occupy more bandwidth than the quantum signal itself. In both cases, the spectral efficiency could at least be doubled without pilots.…”

Section: Introductionmentioning

confidence: 99%

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Continuous variable quantum key distribution with a real local oscillator using simultaneous pilot signals

2017

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In this Letter, we propose a novel implementation of continuous variable quantum key distribution that operates with a real local oscillator placed at the receiver site. In addition, pulsing of the continuous wave laser sources is not required, leading to an extraordinary practical and secure setup. It is suitable for arbitrary schemes based on modulated coherent states and heterodyne detection. The shown results include transmission experiments, as well as an excess noise analysis applying a discrete 8-state phase modulation. Achievable key rates under collective attacks are estimated. The results demonstrate the high potential of the approach to achieve high secret key rates at relatively low effort and cost.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Continuous variable quantum key distribution with a real local oscillator using simultaneous pilot signals

2017

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“…Inspired by the practices of the telecom industry, multiplexing by the modulation frequencies of the quantum signal and a reference signal, a so-called pilot tone, has been explored as a promising alternative to sequential modulation of reference pulses. In the simplest form of frequency-multiplexing, the frequency-upconverted quantum signal and pilot tone are of the same polarisation and detected using one and the same balanced heterodyne receiver [22][23][24][25]. Starting in 2016, we have been demonstrating that multiplexing of the quantum signal and a pilot tone in the frequency-and polarisation domain [26][27][28] allows for improved suppression of cross-talk and for dedicated pilot and quantum receivers.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Pilot-assisted intradyne reception for high-speed continuous-variable quantum key distribution with true local oscillator

Laudenbach

Schrenk

Pacher

et al. 2019

Quantum

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We present a pilot-assisted coherent intradyne reception methodology for CV-QKD with true local oscillator.An optically phaselocked reference tone, prepared using carriersuppressed optical single-sideband modulation, is multiplexed in polarisation and frequency to the 250 Mbaud quantum signal in order to provide optical frequency-and phase matching between quantum signal and local oscillator. Our concept allows for high symbol rates and can be operated at an extremely low excess-noise level, as validated by experimental measurements.

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“…Heterodyne detection is another type of coherent detection method where the carrier signal and local oscillator have different frequencies. [21][22][23]. This technique is an improvement on the traditional homodyne system and allows for the simultaneous detection of two field quadratures in one measurement [24].…”

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confidence: 99%

Coherent Detection of Discrete Variable Quantum Key Distribution using Homodyne Technique

KAMRAN,

JAMAL,

MALIK

et al. 2024

Preprint

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In Discrete Variable Quantum Key Distribution (DV-QKD), the homodyne detection method is frequently employed for its simplicity in use, effectiveness in terms of error correction, and suitability with contemporary optical communication systems. Being a coherent detection method, it relies on a local oscillator whose frequency is matched to that of the transmitted carrier's signal. In this paper, we evaluate a Free Space Optical (FSO) DV-QKD system based on the KMB09 protocol using Homodyne detection under random phase fluctuation and depolarizing noise error. We present simulation results for System Efficiency and Quantum Bit Error Rate (QBER) for the proposed model. An obtained efficiency ({$25\%$}) for our proposed DV-QKD system model shows that under atmospheric turbulence and noise effect and it is in line with the available analytical results. However, the inclusion of random phase fluctuation and noise led to higher-than-normal QBER which is anticipated in a real-world scenario.

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Simple and Efficient Detection Scheme for Continuous Variable Quantum Key Distribution with m-ary Phase-Shift-Keying

Cited by 5 publications

References 2 publications

Continuous variable quantum key distribution with a real local oscillator using simultaneous pilot signals

Continuous variable quantum key distribution with a real local oscillator using simultaneous pilot signals

Pilot-assisted intradyne reception for high-speed continuous-variable quantum key distribution with true local oscillator

Coherent Detection of Discrete Variable Quantum Key Distribution using Homodyne Technique

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