Universal cooling of quantum systems via randomized measurements

• URL: http://arxiv.org/abs/2506.11964v3
• Date: Fri, 25 Jul 2025 13:36:21 GMT
• Title: Universal cooling of quantum systems via randomized measurements
• Authors: Josias Langbehn, George Mouloudakis, Emma King, Raphaël Menu, Igor Gornyi, Giovanna Morigi, Yuval Gefen, Christiane P. Koch,
• Abstract summary: We show that a quantum system can be cooled without knowledge of system details when system-meter interactions are chosen randomly.<n>We identify as the basic mechanism for robust and scalable cooling of complex quantum systems through generic, structure-independent protocols.
• Score: 0.47321763526812183
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Designing cooling protocols is believed to require knowledge of the system spectrum. In contrast, cooling in nature occurs whenever the system is coupled to a cold bath. How does nature know how to cool? A natural cold bath can be mimicked with a reservoir of "meter" qubits that are initialized in their ground state. We show that a quantum system can be cooled without knowledge of system details when system-meter interactions and meter splittings are chosen randomly. For sufficiently small interaction strengths and long interaction times, the protocol ensures that resonant energy-exchange processes, leading to cooling, dominate over heating. Effectively, the dynamics is then captured by the rotating-wave approximation, which we identify as the basic mechanism for robust and scalable cooling of complex quantum systems through generic, structure-independent protocols. This offers a versatile universal framework for controlling quantum matter far from equilibrium, in particular, for quantum computing and simulation.

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