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

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.

13 pages, 7 figures, submitted to Phys. Rev. A

References in corpus (5)

• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Strong Coupling of a Spin Ensemble to a Superconducting Resonator
• A Straightforward Introduction to Continuous Quantum Measurement
• Manipulation and Detection of a Trapped Yb+ Ion Hyperfine Qubit
• Cavity QED with magnetically coupled collective spin states

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• Proposal for detection of a single electron spin in a microwave resonator
• Fundamental limitations in spin-ensemble quantum memories for cavity fields
• Optimal control of an inhomogeneous spin ensemble coupled to a cavity
• Stationary and uniform entanglement distribution in qubit networks with quasi-local dissipation
• Preparing two-atom entangled state in a cavity and probing it via quantum non-demolition measurement
• Generating resonating valence bond states through Dicke subradiance
• Ancilla mediated qubit readout and heralded entanglement between rare-earth dopant ions in crystals
• Entangling non planar molecules via inversion doublet transition with negligible spontaneous emission
• Controlling coherence between waveguide-coupled quantum dots
• Measurement enhances long-distance Entanglement generation in spin chains with dissipative processes