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Strategies for entangling remote spins with unequal coupling to an optically active mediator

Gauger, EM; Rohde, PP; Stoneham, AM; Lovett, BW; (2008) Strategies for entangling remote spins with unequal coupling to an optically active mediator. NEW J PHYS , 10 , Article 073027. 10.1088/1367-2630/10/7/073027. Green open access

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Abstract

We demonstrate that two remote qubits can be entangled through an optically active intermediary even if the coupling strengths between mediator and qubits are different. This is true for a broad class of interactions. We consider two contrasting scenarios. Firstly, we extend the analysis of a previously studied gate operation which relies on pulsed, dynamical control of the optical state and which may be performed quickly. We show that remote spins can be entangled in this case even when the intermediary coupling strengths are unequal. Secondly, we propose an alternative adiabatic control procedure, and find that the system requirements become even less restrictive in this case. The scheme could be tested immediately in a range of systems including molecules, quantum dots, or defects in crystals.

Type: Article
Title: Strategies for entangling remote spins with unequal coupling to an optically active mediator
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1367-2630/10/7/073027
Publisher version: http://dx.doi.org/10.1088/1367-2630/10/7/073027
Language: English
Additional information: Text made available to UCL Discovery by kind permission of IOP Publishing, 2012
Keywords: QUANTUM, SILICON, GATES, DIAMOND, QUBITS
UCL classification: UCL > Provost and Vice Provost Offices
UCL > Provost and Vice Provost Offices > UCL BEAMS
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences
UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > London Centre for Nanotechnology
URI: https://discovery.ucl.ac.uk/id/eprint/87272
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