Measurement-induced two-qubit entanglement in a bad cavity: Fundamental and practical considerations

Brian Julsgaard; Klaus Mølmer

doi:10.1103/PhysRevA.85.032327

Measurement-induced two-qubit entanglement in a bad cavity: Fundamental and practical considerations

Department of Physics and Astronomy

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13 Citations (Scopus)

Abstract

An entanglement-generating protocol is described for two qubits coupled to a cavity field in the bad-cavity limit. By measuring the amplitude of a field transmitted through the cavity, an entangled spin-singlet state can be established probabilistically. Both fundamental limitations and practical measurement schemes are discussed, and the influence of dissipative processes and inhomogeneities in the qubits are analyzed. The measurement-based protocol provides criteria for selecting states with an infidelity scaling linearly with the qubit-decoherence rate.

Original language	English
Journal	Physical Review A
Volume	85
Issue	3
Pages (from-to)	032327
Number of pages	12
ISSN	2469-9926
DOIs	https://doi.org/10.1103/PhysRevA.85.032327
Publication status	Published - 21 Mar 2012

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10.1103/PhysRevA.85.032327

Cite this

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abstract = "An entanglement-generating protocol is described for two qubits coupled to a cavity field in the bad-cavity limit. By measuring the amplitude of a field transmitted through the cavity, an entangled spin-singlet state can be established probabilistically. Both fundamental limitations and practical measurement schemes are discussed, and the influence of dissipative processes and inhomogeneities in the qubits are analyzed. The measurement-based protocol provides criteria for selecting states with an infidelity scaling linearly with the qubit-decoherence rate.",

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AB - An entanglement-generating protocol is described for two qubits coupled to a cavity field in the bad-cavity limit. By measuring the amplitude of a field transmitted through the cavity, an entangled spin-singlet state can be established probabilistically. Both fundamental limitations and practical measurement schemes are discussed, and the influence of dissipative processes and inhomogeneities in the qubits are analyzed. The measurement-based protocol provides criteria for selecting states with an infidelity scaling linearly with the qubit-decoherence rate.

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