Measurement-assisted quantum communication in spin channels with dephasing

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...

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Bibliographic Details
Published inNew journal of physics Vol. 17; no. 10; pp. 103041 - 103051
Main Authors Bayat, Abolfazl, Omar, Yasser
Format Journal Article
LanguageEnglish
Published Bristol IOP Publishing 19.10.2015
Subjects
03.67.-a
Channels
Decoupling
dephasing
Environmental effects
Joining
measurement assisted transport
Physics
Probability theory
projective measurement
Proposals
quantum measurement
Qubits (quantum computing)
Receivers
state transfer
Statistical analysis
Tuning
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Summary: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.
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ISSN:1367-2630
1367-2630
DOI:10.1088/1367-2630/17/10/103041