Entanglement verification for quantum key distribution systems with an underlying bipartite qubit-mode structure

Details Entanglement verification for quantum key distribution systems with an underlying bipartite qubit-mode structure Entanglement verification for quantum key distribution systems with an underlying bipartite qubit-mode structure

2005-10-03

arxiv.org/abs/quant-ph/0510022v2

Phys. Rev. A 73, 012341 (2006)

Physics

Quantum Physics

6 pages, 2 figures, v2: final version

Scientific paper

10.1103/PhysRevA.73.012341

We consider entanglement detection for quantum key distribution systems that use two signal states and continuous variable measurements. This problem can be formulated as a separability problem in a qubit-mode system. To verify entanglement, we introduce an object that combines the covariance matrix of the mode with the density matrix of the qubit. We derive necessary separability criteria for this scenario. These criteria can be readily evaluated using semidefinite programming and we apply them to the specific quantum key distribution protocol.

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