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dc.contributor.authorPing, Y.
dc.contributor.authorJefferson, J.H.
dc.contributor.authorLovett, B.W.
dc.identifier.citationPing , Y , Jefferson , J H & Lovett , B W 2014 , ' Coherent and passive one dimensional quantum memory ' , New Journal of Physics , vol. 16 , 103025 .
dc.identifier.otherORCID: /0000-0001-5142-9585/work/47136569
dc.descriptionBWL acknowledges the Royal Society for a University Research Fellowshipen
dc.description.abstractWe show that the state of a flying qubit may be transferred to a chain of identical, (near) ferromagnetically polarized, but non-interacting, static spin-1/2 particles in a passive way. During this process the flying qubit is coherently polarized, emerging in the direction of the majority static spins. We conjecture that this process is reversible for any number of flying qubits injected sequentially in an arbitrary superposition state, proving this explicitly for an arbitrary state of one and two flying qubits. We also find a special case in which we are able to prove the conjecture for an arbitrary number of qubits. Our architecture thus has the potential to be exploited as a passive quantum memory to encode the flying qubits without the necessity of resetting between successive encoding operations. We also illustrate that the quantum information may be spread over many static spins in the memory chain, making the mechanism resistant to spin decoherence and other imperfections. We discuss implementing the memory system with trapped bosonic atoms, controlled by a spatial light modulator.
dc.relation.ispartofNew Journal of Physicsen
dc.subjectQC Physicsen
dc.titleCoherent and passive one dimensional quantum memoryen
dc.typeJournal articleen
dc.contributor.sponsorThe Royal Societyen
dc.contributor.institutionUniversity of St Andrews. School of Physics and Astronomyen
dc.contributor.institutionUniversity of St Andrews. Condensed Matter Physicsen
dc.description.statusPeer revieweden

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