A quantum repeater based on decoherence free subspaces
Autor: | Dieter Jaksch, U. Dorner, Alexander Klein |
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Jazyk: | angličtina |
Rok vydání: | 2016 |
Předmět: |
Physics
Nuclear and High Energy Physics Quantum network Quantum Physics Quantum decoherence Decoherence-free subspaces General Physics and Astronomy FOS: Physical sciences Statistical and Nonlinear Physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Theoretical Computer Science Quantum technology Computational Theory and Mathematics Quantum error correction Quantum mechanics Quantum operation Quantum dissipation Quantum Physics (quant-ph) Mathematical Physics Quantum Zeno effect |
Popis: | 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. 22 pages, 18 figures, accepted for publication in Quantum Information & Computation |
Databáze: | OpenAIRE |
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