{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,7]],"date-time":"2026-10-07T23:46:14Z","timestamp":1791416774044,"version":"4.3.3"},"reference-count":46,"publisher":"American Association for the Advancement of Science (AAAS)","issue":"41","content-domain":{"domain":["www.science.org"],"crossmark-restriction":true},"short-container-title":["Sci. Adv."],"published-print":{"date-parts":[[2025,10,10]]},"abstract":"<jats:p>Classical self-sustained oscillators, which generate periodic motion without periodic external forcing, are ubiquitous in science and technology. The realization of nonclassical self-oscillators is an important goal of quantum physics. We here present the experimental implementation of a quantum van der Pol oscillator, a paradigmatic autonomous quantum driven-dissipative system with nonlinear damping, using a single trapped atom. We demonstrate the existence of a quantum limit cycle in phase space in the absence of a drive and the occurrence of quantum synchronization when the nonlinear oscillator is externally driven. We additionally show that synchronization can be enhanced with the help of squeezing perpendicular to the direction of the drive and, counterintuitively, linear dissipation. We also observe the bifurcation to a bistable phase-space distribution for large squeezing. Our results pave the way for the exploration of self-sustained quantum oscillators and their application to quantum technology.<\/jats:p>","DOI":"10.1126\/sciadv.ady5649","type":"journal-article","created":{"date-parts":[[2025,10,10]],"date-time":"2025-10-10T17:59:09Z","timestamp":1760119149000},"update-policy":"https:\/\/doi.org\/10.34133\/aaas_crossmark","source":"Crossref","is-referenced-by-count":24,"title":["Experimental realization and synchronization of a quantum van der Pol oscillator"],"prefix":"10.1126","volume":"11","author":[{"ORCID":"https:\/\/orcid.org\/0009-0006-4517-2158","authenticated-orcid":true,"given":"Yi","family":"Li","sequence":"first","affiliation":[{"name":"CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China."},{"name":"Anhui Province Key Laboratory of Scientific Instrument Development and Application, University of Science and Technology of China, Hefei 230026, China."},{"name":"Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0002-8849-8802","authenticated-orcid":true,"given":"Zihan","family":"Xie","sequence":"additional","affiliation":[{"name":"CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China."},{"name":"Anhui Province Key Laboratory of Scientific Instrument Development and Application, University of Science and Technology of China, Hefei 230026, China."},{"name":"Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0003-4509-6045","authenticated-orcid":true,"given":"Xiaodong","family":"Yang","sequence":"additional","affiliation":[{"name":"Institute of Quantum Precision 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China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0001-8945-3959","authenticated-orcid":true,"given":"Xingyu","family":"Zhao","sequence":"additional","affiliation":[{"name":"CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 230026, China."},{"name":"Anhui Province Key Laboratory of Scientific Instrument Development and Application, University of Science and Technology of China, Hefei 230026, China."},{"name":"Hefei National Laboratory, University of Science and Technology of China, Hefei 230088, China."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0009-0009-4427-7734","authenticated-orcid":true,"given":"Xu","family":"Cheng","sequence":"additional","affiliation":[{"name":"CAS Key Laboratory of Microscale Magnetic Resonance and School of Physical Sciences, University of Science and Technology of China, Hefei 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