Composable security for continuous variable quantum key distribution: Trust levels and practical key rates in wired and wireless networks
@article{Pirandola2021ComposableSF, title={Composable security for continuous variable quantum key distribution: Trust levels and practical key rates in wired and wireless networks}, author={Stefano Pirandola}, journal={Physical Review Research}, year={2021} }
Continuous variable (CV) quantum key distribution (QKD) provides a powerful setting for secure quantum communications, thanks to the use of room-temperature off-the-shelf optical devices and the potential to reach much higher rates than the standard discrete-variable counterpart. In this work, we provide a general framework for studying the composable finite-size security of CV-QKD with Gaussian-modulated coherent-state protocols under various levels of trust for the loss and noise experienced…
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66 References
Finite-size security of continuous-variable quantum key distribution with digital signal processing
- Computer ScienceNature Communications
- 2021
A tight and robust method of estimating fidelity of an optical pulse to a coherent state via heterodyne measurements is proposed and a binary phase modulated CV-QKD protocol is constructed and proves its security in the finite-key-size regime against general coherent attacks, based on proof techniques of DV QKD.
Long-Distance Continuous-Variable Quantum Key Distribution over 202.81 km of Fiber.
- PhysicsPhysical review letters
- 2020
This record-breaking implementation of the continuous-variable quantum key distribution doubles the previous distance record and shows the road for long-distance and large-scale secure quantum key Distribution using room-temperature standard telecom components.
High-rate measurement-device-independent quantum cryptography
- Computer ScienceNature Photonics
- 2015
A coherent-state network protocol able to achieve remarkably high key rates at metropolitan distances, in fact three orders of magnitude higher than those currently achieved, is designed and proposed.
Security proof of continuous-variable quantum key distribution using three coherent states
- Computer Science
- 2018
A thorough and detailed security proof in the limit of infinite signal states which allows us to lower bound the secret key rate is presented and this is in the context of collective eavesdropping attacks and reverse reconciliation postprocessing.
Asymptotic Security of Continuous-Variable Quantum Key Distribution with a Discrete Modulation
- Computer Science, MathematicsPhysical Review X
- 2019
We establish a lower bound on the asymptotic secret key rate of continuous-variable quantum key distribution with a discrete modulation of coherent states. The bound is valid against collective…
Satellite quantum communications: Fundamental bounds and practical security
- Computer SciencePhysical Review Research
- 2021
This work applies and extends recent results in free-space quantum communications to determine the ultimate limits at which secret bits can be distributed via satellites, and studies the composable finite-size secret key rates that are achievable by protocols of continuous variable quantum key distribution, for both downlink and uplink.
Continuous-Variable Quantum Key Distribution using Thermal States
- Computer Science, Physics
- 2012
The security of continuous-variable quantum key distribution using thermal (or noisy) Gaussian resource states is analyzed against collective Gaussian attacks using direct and reverse reconciliation where both protocols use either homodyne or heterodyne detection to improve robustness to channel noise.
Security of Continuous-Variable Quantum Key Distribution via a Gaussian de Finetti Reduction.
- Computer Science, MathematicsPhysical review letters
- 2017
This work considers a new type of Gaussian de Finetti reduction, that exploits the invariance of some continuous-variable protocols under the action of the unitary group U(n) (instead of the symmetric group S_{n} as in usual definetti theorems), and introduces generalized SU(2,2) coherent states.
Hacking Alice's box in continuous-variable quantum key distribution
- Computer Science, MathematicsPhysical Review A
- 2018
This paper considers an attack on a coherent-state protocol, where Eve not only taps the main communication channel but also hacks Alice's device, and shows how the key rate rapidly deteriorates for increasing photons.
Feasibility of continuous-variable quantum key distribution with noisy coherent states
- Computer Science
- 2010
This work considers the method of sender-side state purification to compensate the preparation noise and shows its applicability in the realistic conditions of channel loss, untrusted channel excess noise, and trusted detection noise.