Thermodynamics of Quantum Feedback Cooling
dc.contributor.author | Liuzzo-Scorpo, P | |
dc.contributor.author | Correa, LA | |
dc.contributor.author | Schmidt, R | |
dc.contributor.author | Adesso, G | |
dc.date.accessioned | 2019-07-04T09:21:05Z | |
dc.date.issued | 2016-02-04 | |
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_GB |
dc.description.sponsorship | COST Action | en_GB |
dc.description.sponsorship | University of Nottingham | en_GB |
dc.description.sponsorship | Spanish MINECO | en_GB |
dc.description.sponsorship | Generalitat de Catalunya Consejo Interdepartamental de Investigación e Innovación Tecnológica | en_GB |
dc.description.sponsorship | Academy of Finland | en_GB |
dc.description.sponsorship | Foundational Questions Institute | en_GB |
dc.description.sponsorship | European Research Council | en_GB |
dc.identifier.citation | Vol. 18 (2), article 48 | en_GB |
dc.identifier.doi | 10.3390/e18020048 | |
dc.identifier.grantnumber | MP1209 | en_GB |
dc.identifier.grantnumber | FIS2013-40627-P | en_GB |
dc.identifier.grantnumber | 2014 SGR 966 | en_GB |
dc.identifier.grantnumber | 284621 | en_GB |
dc.identifier.grantnumber | FQXi-RFP3-1317 | en_GB |
dc.identifier.grantnumber | 637352 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/37831 | |
dc.language.iso | en | en_GB |
dc.publisher | MDPI | en_GB |
dc.rights | © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/). | en_GB |
dc.subject | feedback cooling | en_GB |
dc.subject | quantum thermodynamics | en_GB |
dc.subject | quantum correlations | en_GB |
dc.title | Thermodynamics of Quantum Feedback Cooling | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2019-07-04T09:21:05Z | |
dc.identifier.issn | 1099-4300 | |
exeter.article-number | UNSP 48 | en_GB |
dc.description | This is the final version. Available on open access from MDPI via the DOI in this reocrd | en_GB |
dc.identifier.journal | Entropy | en_GB |
dc.rights.uri | http://creativecommons.org/licenses/by/4.0/ | en_GB |
dcterms.dateAccepted | 2016-01-28 | |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2016-02-04 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2019-07-04T09:17:19Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2019-07-04T09:21:11Z | |
refterms.panel | B | en_GB |
Files in this item
This item appears in the following Collection(s)
Except where otherwise noted, this item's licence is described as © 2016 by the authors; licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons by Attribution (CC-BY) license (http://creativecommons.org/licenses/by/4.0/).