Enhanced dynamical entanglement transfer with multiple qubits

Journal Article · Wed Feb 15 04:00:00 EST 2006 · Physical Review. A

DOI:https://doi.org/10.1103/PHYSREVA.73.022312· OSTI ID:20974528

Serafini, A; Bose, S ^[1]; Paternostro, M; Kim, M S ^[2]

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1. Department of Physics and Astronomy, University College London, Gower Street, London WC1E 6BT (United Kingdom)
2. School of Mathematics and Physics, Queen's University, Belfast BT7 1NN (United Kingdom)

We present two strategies to enhance the dynamical entanglement transfer from continuous-variable (CV) to finite-dimensional systems by employing multiple qubits. First, we consider the entanglement transfer to a composite finite-dimensional system of many qubits simultaneously interacting with a bipartite CV field. We show that, considering realistic conditions in the generation of CV entanglement, a small number of qubits resonantly coupled to the CV system are sufficient for an almost complete dynamical transfer of the entanglement. Our analysis also sheds further light on the transition between the microscopic and macroscopic behaviors of composite finite-dimensional systems coupled to bosonic fields (like atomic clouds interacting with light). Furthermore, we present a protocol based on sequential interactions of the CV system with some ancillary qubit systems and on subsequent measurements, allowing us to probabilistically convert CV entanglement into 'almost-perfect' Bell pairs of two qubits. Our proposals are suited for realizations in various experimental settings, ranging from cavity-QED to cavity-integrated superconducting devices.

• OSTI ID: 20974528
• Journal Information: Physical Review. A, Journal Name: Physical Review. A Journal Issue: 2 Vol. 73; ISSN 1050-2947; ISSN PLRAAN
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
BELL THEOREM
QUANTUM COMPUTERS
QUANTUM ELECTRODYNAMICS
QUANTUM ENTANGLEMENT
QUANTUM MECHANICS
QUBITS
SUPERCONDUCTING DEVICES