Photonic Engineering for CV-QKD Over Earth-Satellite Channels

He, Mingjian; Malaney, Robert; Green, Jonathan

doi:10.1109/icc.2019.8762003

Cited by 9 publications

(11 citation statements)

References 33 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Thus, we will make use of this result emphasizing that the key rates presented here represent only a lower bound of the real values. For a complete discussion of how to calculate the key rate when non-Gaussian states are involved we refer the reader to [19], [20].…”

Section: Calculating the Key Rate In Cv-qkdmentioning

confidence: 99%

Improving QKD for Entangled States with Low Squeezing via Non-Gaussian Operations

Villaseñor

Malaney

2019

2019 IEEE Globecom Workshops (GC Wkshps)

Self Cite

View full text Add to dashboard Cite

In this work we focus on evaluating the effectiveness of two non-Gaussian operations, photon subtraction (PS) and quantum scissors (QS) in terms of Continuous Variable (CV)-Quantum Key Distribution (QKD) over lossy channels. Each operation is analysed in two scenarios, one with the operation applied transmitter-side to a Two-Mode Squeezed Vacuum (TMSV) state and a second with the operation applied to the TMSV state receiver-side. We numerically evaluate the entanglement and calculate the QKD key rates produced in all four possible scenarios. Our results show that for a fixed value of initial squeezing in the TMSV state, the states produced by the non-Gaussian operations are more robust to loss, being capable of generating higher key rates for a given loss. More specifically, we find that for values of initial TMSV squeezing below 1.5dB the highest key rates are obtained by means of transmitter-QS. On the other hand, for squeezing above 1.5dB we find that receiver-PS produces higher key rates. Our results will be important for future CV-QKD implementations over free-space channels, such as the Earth-satellite channel.

show abstract

Section: Calculating the Key Rate In Cv-qkdmentioning

confidence: 99%

Improving QKD for Entangled States with Low Squeezing via Non-Gaussian Operations

Villaseñor

Malaney

2019

2019 IEEE Globecom Workshops (GC Wkshps)

Self Cite

View full text Add to dashboard Cite

show abstract

“…Several proposals for satellite-based quantum networks have been made that use satellite-to-ground transmission, ground-tosatellite transmission, or both 50,53,54,[61][62][63][64][65][66][67][68][69] . Recent experiments 65,[70][71][72][73][74][75][76] (see also ref.…”

Section: Introductionmentioning

confidence: 99%

Spooky action at a global distance: analysis of space-based entanglement distribution for the quantum internet

et al. 2021

View full text Add to dashboard Cite

Recent experimental breakthroughs in satellite quantum communications have opened up the possibility of creating a global quantum internet using satellite links. This approach appears to be particularly viable in the near term, due to the lower attenuation of optical signals from satellite to ground, and due to the currently short coherence times of quantum memories. The latter prevents ground-based entanglement distribution using atmospheric or optical-fiber links at high rates over long distances. In this work, we propose a global-scale quantum internet consisting of a constellation of orbiting satellites that provides a continuous, on-demand entanglement distribution service to ground stations. The satellites can also function as untrusted nodes for the purpose of long-distance quantum-key distribution. We develop a technique for determining optimal satellite configurations with continuous coverage that balances both the total number of satellites and entanglement-distribution rates. Using this technique, we determine various optimal satellite configurations for a polar-orbit constellation, and we analyze the resulting satellite-to-ground loss and achievable entanglement-distribution rates for multiple ground station configurations. We also provide a comparison between these entanglement-distribution rates and the rates of ground-based quantum repeater schemes. Overall, our work provides the theoretical tools and the experimental guidance needed to make a satellite-based global quantum internet a reality.

show abstract

“…For each subchannel, we adopt the same noise and efficiency parameters from our previous work. 20 Specifically, we set the excess noise 𝜀 = 0.1, the detection noise 𝜈 = 1.1 (both in vacuum noise units), the detection efficiency 𝜂 d = 0.68, and the reconciliation efficiency 𝜂 r = 0.95. We assume the number of equivalent EPR states of the PDC state created by Alice is K max = 5.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…In our previous work, we have shown that for a CV-QKD protocol, the single-photon non-Gaussian operations offer a higher secret key rate and success probability relative to their multiphoton counterparts for a given type of non-Gaussian operation. 20 As such, in this work, we mainly focus on single-photon non-Gaussian operations. We will also investigate zero-photon non-Gaussian operations which we have not considered in our previouswork.…”

Section: Multimode States With Non-gaussian Operationsmentioning

confidence: 99%

“…Considering the scheme with non-Gaussian operations and a comparison scheme without any non-Gaussian operation, all of the above performance improvements [1][2][3][4][5][6][7][8][9] are under the assumption that the squeezing of the initial entangled state (an EPR state) is fixed to a certain value for both schemes. However, for certain CV-QKD protocols, 19,20 if the squeezing of the initial EPR state sent through the channel is optimized based on the loss of that channel, the scheme with non-Gaussian operations does not provide higher secret key rates (optimizations for the two schemes are carried out independently).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Multimode CV‐QKD with non‐Gaussian operations

He¹,

Malaney²,

Green

2020

Quantum Engineering

Self Cite

View full text Add to dashboard Cite

Summary Non‐Gaussian operations have been studied intensively in recent years due to their ability to increase the secret key rate for certain CV‐QKD protocols. However, most previous studies on such protocols are carried out in a single‐mode setting, even though in reality any quantum state contains multimode components in frequency space. In this work, we investigate the use of non‐Gaussian operations in a multimode CV‐QKD system. Our main finding is that, contrary to single‐mode CV‐QKD systems, in generic multimode CV‐QKD systems, it is possible to use non‐Gaussian operations to increase the optimized secret key rate. More specifically, we find that at losses of order 30dB, which represents a distance of order 160km and the effective maximum distance for CV‐QKD, the key rate for multimode non‐Gaussian operations can be orders of magnitude higher than single‐mode operations. Our results are important for real‐world CV‐QKD systems, especially those dependent on quantum error correction—a process that requires non‐Gaussian effects.

show abstract

Photonic Engineering for CV-QKD Over Earth-Satellite Channels

Cited by 9 publications

References 33 publications

Improving QKD for Entangled States with Low Squeezing via Non-Gaussian Operations

Improving QKD for Entangled States with Low Squeezing via Non-Gaussian Operations

Spooky action at a global distance: analysis of space-based entanglement distribution for the quantum internet

Multimode CV‐QKD with non‐Gaussian operations

Contact Info

Product

Resources

About