A quantum repeater based on decoherence free subspaces

Details A quantum repeater based on decoherence free subspaces A quantum repeater based on decoherence free subspaces

2007-11-12

arxiv.org/abs/0711.1831v1

Quant. Inf. Comp. 8, 0468 (2008).

Physics

Quantum Physics

22 pages, 18 figures, accepted for publication in Quantum Information & Computation

Scientific paper

We study a quantum repeater which is based on decoherence free quantum gates recently proposed by Klein et al. [Phys. Rev. A 73, 012332 (2006)]. A number of operations on the decoherence free subspace in this scheme makes use of an ancilla qubit, which undergoes dephasing and thus introduces decoherence to the system. We examine how this decoherence affects entanglement swapping and purification as well as the performance of a quantum repeater. We compare the decoherence free quantum repeater with a quantum repeater based on qubits that are subject to decoherence and show that it outperforms the latter when decoherence due to long waiting times of conventional qubits becomes significant. Thus, a quantum repeater based on decoherence free subspaces is a possibility to greatly improve quantum communication over long or even intercontinental distances.

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