dc.contributor.author | Correa, LA | |
dc.contributor.author | Perarnau-Llobet, M | |
dc.contributor.author | Hovhannisyan, KV | |
dc.contributor.author | Hernandez-Santana, S | |
dc.contributor.author | Mehboudi, M | |
dc.contributor.author | Sanpera, A | |
dc.date.accessioned | 2019-07-04T10:53:52Z | |
dc.date.issued | 2017-12-04 | |
dc.description.abstract | We consider the problem of estimating the temperature
T
of a very cold equilibrium sample. The temperature estimates are drawn from measurements performed on a quantum Brownian probe strongly coupled to it. We model this scenario by resorting to the canonical Caldeira-Leggett Hamiltonian and find analytically the exact stationary state of the probe for arbitrary coupling strength. In general, the probe does not reach thermal equilibrium with the sample, due to their nonperturbative interaction. We argue that this is advantageous for low-temperature thermometry, as we show in our model that (i) the thermometric precision at low
T
can be significantly enhanced by strengthening the probe-sampling coupling, (ii) the variance of a suitable quadrature of our Brownian thermometer can yield temperature estimates with nearly minimal statistical uncertainty, and (iii) the spectral density of the probe-sample coupling may be engineered to further improve thermometric performance. These observations may find applications in practical nanoscale thermometry at low temperatures—a regime which is particularly relevant to quantum technologies. | en_GB |
dc.description.sponsorship | European Research Council | en_GB |
dc.description.sponsorship | Spanish MINECO | en_GB |
dc.description.sponsorship | Generalitat de Catalunya | en_GB |
dc.description.sponsorship | COST Action | en_GB |
dc.description.sponsorship | CELLEX-ICFO-MPQ | en_GB |
dc.description.sponsorship | Villum Fonden | en_GB |
dc.description.sponsorship | “la Caixa”-Severo Ochoa Program | en_GB |
dc.identifier.citation | Vol. 96 (6), article 062103 | en_GB |
dc.identifier.doi | 10.1103/PhysRevA.96.062103 | |
dc.identifier.grantnumber | 637352 | en_GB |
dc.identifier.grantnumber | FIS2013-40627-P | en_GB |
dc.identifier.grantnumber | FIS2016-80681-P | en_GB |
dc.identifier.grantnumber | FIS2013-46768-P | en_GB |
dc.identifier.grantnumber | FIS2016-80773-P | en_GB |
dc.identifier.grantnumber | SEV-2015-0522 | en_GB |
dc.identifier.grantnumber | 2014 SGR 966 | en_GB |
dc.identifier.grantnumber | SGR-875 | en_GB |
dc.identifier.grantnumber | MP1209 | en_GB |
dc.identifier.uri | http://hdl.handle.net/10871/37840 | |
dc.language.iso | en | en_GB |
dc.publisher | American Physical Society | en_GB |
dc.rights | © 2017 American Physical Society | en_GB |
dc.title | Enhancement of low-temperature thermometry by strong coupling | en_GB |
dc.type | Article | en_GB |
dc.date.available | 2019-07-04T10:53:52Z | |
dc.identifier.issn | 2469-9926 | |
exeter.article-number | ARTN 062103 | en_GB |
dc.description | This is the final version. Available from American Physical Society via the DOI in this record | en_GB |
dc.identifier.journal | Physical Review A | en_GB |
dc.rights.uri | http://www.rioxx.net/licenses/all-rights-reserved | en_GB |
rioxxterms.version | VoR | en_GB |
rioxxterms.licenseref.startdate | 2017-12-04 | |
rioxxterms.type | Journal Article/Review | en_GB |
refterms.dateFCD | 2019-07-04T10:49:39Z | |
refterms.versionFCD | VoR | |
refterms.dateFOA | 2019-07-04T10:54:01Z | |
refterms.panel | B | en_GB |