{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,31]],"date-time":"2026-07-31T23:06:43Z","timestamp":1785539203984,"version":"3.56.0"},"reference-count":103,"publisher":"MDPI AG","issue":"2","license":[{"start":{"date-parts":[[2023,1,20]],"date-time":"2023-01-20T00:00:00Z","timestamp":1674172800000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"U.S. Department of Energy (DOE), Office of Sciences, Basic Energy Sciences","award":["DE-SC0017890"],"award-info":[{"award-number":["DE-SC0017890"]}]},{"name":"Berlin Mathematics Center","award":["MATH+ (AA1-6)"],"award-info":[{"award-number":["MATH+ (AA1-6)"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Entropy"],"abstract":"<jats:p>We investigated coupled-qubit-based thermal machines powered by quantum measurements and feedback. We considered two different versions of the machine: (1) a quantum Maxwell\u2019s demon, where the coupled-qubit system is connected to a detachable single shared bath, and (2) a measurement-assisted refrigerator, where the coupled-qubit system is in contact with a hot and cold bath. In the quantum Maxwell\u2019s demon case, we discuss both discrete and continuous measurements. We found that the power output from a single qubit-based device can be improved by coupling it to the second qubit. We further found that the simultaneous measurement of both qubits can produce higher net heat extraction compared to two setups operated in parallel where only single-qubit measurements are performed. In the refrigerator case, we used continuous measurement and unitary operations to power the coupled-qubit-based refrigerator. We found that the cooling power of a refrigerator operated with swap operations can be enhanced by performing suitable measurements.<\/jats:p>","DOI":"10.3390\/e25020204","type":"journal-article","created":{"date-parts":[[2023,1,20]],"date-time":"2023-01-20T02:43:29Z","timestamp":1674182609000},"page":"204","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":21,"title":["Measurement-Based Quantum Thermal Machines with Feedback Control"],"prefix":"10.3390","volume":"25","author":[{"given":"Bibek","family":"Bhandari","sequence":"first","affiliation":[{"name":"Institute for Quantum Studies, Chapman University, Orange, CA 92866, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Robert","family":"Czupryniak","sequence":"additional","affiliation":[{"name":"Institute for Quantum Studies, Chapman University, Orange, CA 92866, USA"},{"name":"Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA"},{"name":"Center for Coherence and Quantum Optics, University of Rochester, Rochester, NY 14627, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4626-2869","authenticated-orcid":false,"given":"Paolo Andrea","family":"Erdman","sequence":"additional","affiliation":[{"name":"Department of Mathematics and Computer Science, Freie Universit\u00e4t Berlin, Arnimallee 6, 14195 Berlin, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Andrew N.","family":"Jordan","sequence":"additional","affiliation":[{"name":"Institute for Quantum Studies, Chapman University, Orange, CA 92866, USA"},{"name":"Department of Physics and Astronomy, University of Rochester, Rochester, NY 14627, USA"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2023,1,20]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"118","DOI":"10.1038\/nphys3169","article-title":"Towards quantum thermodynamics in electronic circuits","volume":"11","author":"Pekola","year":"2015","journal-title":"Nat. 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