Thermodynamics of quantum feedback cooling

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en Liuzzo-Scorpo, Pietro Correa, Luis A. Schmidt, Rebecca Adesso, Gerardo 2017-05-11T09:01:46Z 2017-05-11T09:01:46Z 2016
dc.identifier.citation Liuzzo-Scorpo , P , Correa , L A , Schmidt , R & Adesso , G 2016 , ' Thermodynamics of quantum feedback cooling ' ENTROPY , vol 18 , no. 2 , 48 , pp. 1-15 . DOI: 10.3390/e18020048 en
dc.identifier.issn 1099-4300
dc.identifier.other PURE UUID: a1cda0ff-1dd2-4558-b7cd-c63e3baf29dd
dc.identifier.other PURE ITEMURL:
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dc.description.abstract The ability to initialize quantum registers in pure states lies at the core of many applications of quantum technologies, from sensing to quantum information processing and computation. In this paper, we tackle the problem of increasing the polarization bias of an ensemble of two-level register spins by means of joint coherent manipulations, involving a second ensemble of ancillary spins and energy dissipation into an external heat bath. We formulate this spin refrigeration protocol, akin to algorithmic cooling, in the general language of quantum feedback control, and identify the relevant thermodynamic variables involved. Our analysis is two-fold: On the one hand, we assess the optimality of the protocol by means of suitable figures of merit, accounting for both its work cost and effectiveness; on the other hand, we characterise the nature of correlations built up between the register and the ancilla. In particular, we observe that neither the amount of classical correlations nor the quantum entanglement seem to be key ingredients fuelling our spin refrigeration protocol. We report instead that a more general indicator of quantumness beyond entanglement, the so-called quantum discord, is closely related to the cooling performance. en
dc.format.extent 1-15
dc.format.mimetype application/pdf
dc.language.iso en en
dc.relation.ispartofseries ENTROPY en
dc.relation.ispartofseries Volume 18, issue 2 en
dc.rights openAccess en
dc.subject.other Physics and Astronomy(all) en
dc.subject.other 114 Physical sciences en
dc.title Thermodynamics of quantum feedback cooling en
dc.type A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä fi
dc.description.version Peer reviewed en
dc.contributor.department University of Nottingham
dc.contributor.department Autonomous University of Barcelona
dc.contributor.department Department of Applied Physics
dc.subject.keyword Feedback cooling
dc.subject.keyword Quantum correlations
dc.subject.keyword Quantum thermodynamics
dc.subject.keyword Physics and Astronomy(all)
dc.subject.keyword 114 Physical sciences
dc.identifier.urn URN:NBN:fi:aalto-201705114133
dc.identifier.doi 10.3390/e18020048
dc.type.version publishedVersion

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