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Measurement-assisted quantum communication in spin channels with dephasing

Bayat, A; Omar, Y; (2015) Measurement-assisted quantum communication in spin channels with dephasing. New Journal of Physics , 17 , Article ARTN 1. 10.1088/1367-2630/17/10/103041. Green open access

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Abstract

We propose a protocol for countering the effects of dephasing in quantum state transfer over a noisy spin channel weakly coupled to the sender and receiver qubits. Our protocol, based on performing regular global measurements on the channel, significantly suppresses the nocuous environmental effects and offers much higher fidelities than the traditional no-measurement approach. Our proposal can also operate as a robust two-qubit entangling gate over distant spins. Our scheme counters any source of dephasing, including those for which the well established dynamical decoupling approach fails. Our protocol is probabilistic, given the intrinsic randomness in quantum measurements, but its success probability can be maximized by adequately tuning the rate of the measurements

Type: Article
Title: Measurement-assisted quantum communication in spin channels with dephasing
Open access status: An open access version is available from UCL Discovery
DOI: 10.1088/1367-2630/17/10/103041
Publisher version: http://dx.doi.org/10.1088/1367-2630/17/10/103041
Language: English
Additional information: Content from this work may be used under the terms of the Creative Commons Attribution 3.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
Keywords: measurement assisted transport, state transfer, dephasing, projective measurement, quantum measurement
UCL classification: UCL
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
URI: https://discovery.ucl.ac.uk/id/eprint/1476075
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