Noise and Security Analysis of Trusted Phase Noise Continuous Variable Quantum Key Distribution using a Local Local Oscillator

Ren, Shengjun; Kumar, Rupesh; Wonfor, A.; Tang, Xinke; Penty, R.V.; White, I.H.

doi:10.1109/spawc.2019.8815501

Cited by 5 publications

(5 citation statements)

References 11 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…In the free-space optical (FSO) channel CV-QKD, contributions to the excess noise are quite different from those seen in optical fibre [8]- [10], [16], [20]. In particular, there are studies of TLO CV-QKD protocols in FSO channels that suggest excess noise due to time-of-arrival fluctuations caused by atmospheric turbulence cannot be ignored [21]- [24].…”

Section: Noise Model For Llo Cv-qkd In the Satellite-to-earth Channelmentioning

confidence: 99%

Use of a Local Local Oscillator for the Satellite-to-Earth Channel

Kish

Villaseñor

Malaney

et al. 2021

ICC 2021 - IEEE International Conference on Communications

View full text Add to dashboard Cite

Continuous variable quantum key distribution (CV-QKD) offers information-theoretic secure key sharing between two parties. The sharing of a phase reference frame is an essential requirement for coherent detection in CV-QKD. Due to the potential attacks related to transmitting the local oscillator (LO) alongside quantum signals, there has been a focus on using local LOs (LLOs) to establish a shared phase reference. In this work, we develop a new noise model of a current state-of-theart LLO scheme in the context of the satellite-to-Earth channel.In doing this, we encapsulate detailed phase-screen calculations that determine the coherent efficiency -a critical parameter in free-space CV-QKD that characterizes the wavefront aberrations caused by atmospheric turbulence. Using our new noise model we then determine the CV-QKD key rates for the satellite-to-Earth channel, secure under general attacks in the finite-size regime of the LLO scheme. Our results are of practical importance for nextgeneration quantum-enabled satellites that utilize multi-photon technology as opposed to single-photon technology.

show abstract

Section: Noise Model For Llo Cv-qkd In the Satellite-to-earth Channelmentioning

confidence: 99%

Use of a Local Local Oscillator for the Satellite-to-Earth Channel

Kish

Villaseñor

Malaney

et al. 2021

ICC 2021 - IEEE International Conference on Communications

View full text Add to dashboard Cite

show abstract

“…24,46 ADC Analogue-digital converter (ADC) quantization noise ADC is due to digitizing the output voltage, required by all CV-QKD systems. 24,44,45 This noise term can be suppressed by increasing the number of bits.…”

Section: Detector Excess Noise Component V El Electronic Noisementioning

confidence: 99%

“…Reference pulses are sent with the signals which are used to calibrate the phase offset in the LLO. 44,[65][66][67] However, the phase offset derived from the reference pulses is limited by quantum uncertainty, and the two lasers necessarily introduce some phase drift. In comparison to optical fiber, no phase compensation method exists for the LLO in FSO channels where additional phase noise due to atmospheric turbulence is expected, 68 but these are not insurmountable issues.…”

Section: Local Local Oscillatorsmentioning

confidence: 99%

Feasibility assessment for practical continuous variable quantum key distribution over the satellite‐to‐Earth channel

Kish

Villaseñor

Malaney

et al. 2020

Quantum Engineering

View full text Add to dashboard Cite

Summary Currently, quantum key distribution (QKD) using continuous variable (CV) technology has only been demonstrated over short‐range terrestrial links. Here, we attempt to answer whether CV‐QKD over the much longer satellite‐to‐Earth channel is feasible. To this end, we first review the concepts and technologies that will enable CV‐QKD over the satellite‐to‐Earth channels. We then consider, in the infinite key limit, the simplest‐to‐deploy QKD protocols, the coherent state (CS) QKD protocol with homodyne detection and the CS‐QKD protocol with heterodyne detection. We then focus on the CS‐QKD protocol with heterodyne detection in the pragmatic setting of finite keys, where complete security against general attacks is known. We pay particular attention to the relevant noise terms in the satellite‐to‐Earth channel and their impact on the secret key rates. In system set‐ups where diffraction dominates losses, we find that the main components of the total excess noise are the intensity fluctuations due to scintillation, and the time‐of‐arrival fluctuations between signal and local oscillator. We conclude that for a wide range of pragmatic system models, CS‐QKD with information‐theoretic security in the satellite‐to‐Earth channel is feasible.

show abstract

“…Shot-noise-limited homodyne measurement requires sufficient LO power to reduce the effect of the electronic noise by increasing the signal-to-noise ratio (SNR) [24,43]. ξADC Analogue-digital converter (ADC) quantization noise ξADC is due to digitizing the output voltage, required by all CV-QKD systems [24,44,45]. This noise term can be suppressed by increasing the number of bits.…”

Section: Electronic Noisementioning

confidence: 99%

“…In this system model, two lasers are used, one at Alice for generating the quantum signal and another at Bob for the LLO. To establish a common phase reference, Alice sends low intensity pulses to estimate the phase and correct the heterodyne measurement [44,65]. However, additional excess noise is introduced.…”

Section: B Local Local Oscillatorsmentioning

confidence: 99%

Feasibility Assessment For Practical Continuous Variable Quantum Key Distribution Over The Satellite-to-Earth Channel

Kish,

Villaseñor,

Malaney

et al. 2020

Preprint

View full text Add to dashboard Cite

Currently, quantum key distribution (QKD) using continuous variable (CV) technology has only been demonstrated over short-range terrestrial links. Here we attempt to answer whether CV-QKD over the much longer satellite-to-Earth channel is feasible. To this end, we first review the concepts and technologies that will enable CV-QKD over the satellite-to-Earth channels. We then consider, in the infinite key limit, the simplest-to-deploy QKD protocols, the coherent state (CS) QKD protocol with homodyne detection and the CS-QKD protocol with heterodyne detection. We then focus on the CS-QKD protocol with heterodyne detection in the pragmatic setting of finite keys, where complete security against general attacks is known. We pay particular attention to the relevant noise terms in the satellite-to-Earth channel and their impact on the secret key rates. In system set-ups where diffraction dominates losses, we find that the main components of the total excess noise are the intensity fluctuations due to scintillation, and the time-of-arrival fluctuations between signal and local oscillator. We conclude that for a wide range of pragmatic system models, CS-QKD with information-theoretic unconditional security in the satellite-to-Earth channel is feasible.

show abstract

Noise and Security Analysis of Trusted Phase Noise Continuous Variable Quantum Key Distribution using a Local Local Oscillator

Cited by 5 publications

References 11 publications

Use of a Local Local Oscillator for the Satellite-to-Earth Channel

Use of a Local Local Oscillator for the Satellite-to-Earth Channel

Feasibility assessment for practical continuous variable quantum key distribution over the satellite‐to‐Earth channel

Feasibility Assessment For Practical Continuous Variable Quantum Key Distribution Over The Satellite-to-Earth Channel

Contact Info

Product

Resources

About