IEEE/LEOS Summer Topical Meetings

Continuous-variable QKD with post-selection is secure

Timothy C. Ralph, Nathan Walk, Thomas Symul, Ping Koy Lam

Published Jul 1, 2013• 1 citation

Abstract

Post-selection is a standard part of discrete variable QKD protocols, however attempts to prove security when post-selection is deployed in continuous variable QKD protocols have until now been limited. Here, by using a carefully tailored post-selection protocol, we prove unconditional security and show that significant performance improvements are achieved.

DOI: 10.1109/phosst.2013.6614521

Related papers

Security of a Discretely Signaled Continuous Variable QKD Protocol against Collective Attacks

Zheshen Zhang, Paul L. Voss

We prove security against collective attacks of a four-state discretely signaled continuous variable quantum key distribution protocol with and without post-selection. This protocol is compatible with optical networks and high speed coding techniques.

Frontiers in OpticsJan 1, 20080 citations

Security of Post-selection based Continuous Variable Quantum Key Distribution against Arbitrary Attacks

Nathan Walk, Timothy C. Ralph, Thomas Symul +1 more

We analyse the security and performance of a continuous variable quantum key distribution protocol using post selection, deriving results that are unconditionally secure in the sense of no longer restricting the eavesdroppers attack.

arXiv:1106.0825Conference on Lasers and Electro-OpticsJan 1, 20112 citations

Continuous Variable Quantum Key Distribution: Security, Repeaters and Relativity

Nathan Walk, Timothy C. Ralph, T. G. Downes +2 more

We prove security of a continuous variable quantum key distribution protocol using post selection against non-Gaussian eavesdropper attacks. We discuss CV repeater protocols based on noiseless amplification. We analyze CV QKD between non-inertial, relativistic observers.

International Conference on Quantum InformationJan 1, 20110 citations

Security of continuous-variable quantum cryptography with Gaussian postselection

Nathan Walk, Timothy C. Ralph, Thomas Symul +1 more

We extend the security analysis of continuous variable quantum-key-distribution protocols using a family of post selection schemes to account for arbitrary eavesdropping attacks. We show that the postselection protocol is equivalent to a virtual entanglement-based protocol including a distillation stage. We introduce a particular `Gaussian' post selection and demonstrate that the security can be calculated using only experimentally accessible quantities. Finally, we explicitly evaluate the performance for the case of a noisy Gaussian channel in the limit of unbounded key length and find improvements over all pre-existing continuous variable protocols in realistic regimes.

arXiv:1206.0936Physical Review AFeb 21, 201380 citations

Unconditional security of Gaussian post-selected continuous variable quantum key distribution

Nathan Walk, Thomas Symul, Ping Koy Lam +1 more

Continuous Variable (CV) Quantum Key Distribution (QKD) has the advantage of high raw bit rates due to the high efficiency and high bandwidth of homodyne detection and ease of integration with existing communications infrastructure. CV protocols that employ Post-Selection (PS) [1] - a classical filtering of the measurement results - enjoy additional advantages in terms of versatility and reconciliation efficiency.

Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC)May 1, 20131 citation

One-Round Slicing with Post-Selection for Gaussian-Modulated Continuous-Variable Quantum Key Distribution

Adam Alderton, Muataz Alhussein, Amanda Weerasinghe +2 more

We justify and extend the security of previously reported high data rate CV-QKD experiments. This post-selection strategy affords practical benefits including an extended transmission distance and reduced classical communication requirements versus other methods.

Jan 1, 20260 citations