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X-ORIGINAL-URL:https://iqus.uw.edu/
X-WR-CALNAME:IQuS
X-WR-CALDESC:InQubator for Quantum Simulation
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UID:MEC-aa97d584861474f4097cf13ccb5325da@iqus.uw.edu
DTSTART:20260407T183000Z
DTEND:20260407T193000Z
DTSTAMP:20260126T175200Z
CREATED:20260126
LAST-MODIFIED:20260405
PRIORITY:5
SEQUENCE:5
TRANSP:OPAQUE
SUMMARY:Vari-Cool: a non-unitary quantum variational protocol for simulated cooling
DESCRIPTION:\nMark Rudner, University of Washington\nWe introduce a variational approach for preparing low energy states of arbitrary target Hamiltonians. The protocol is defined in terms of a repeated cycle consisting of p layers of unitary gates applied to the system and ancilla “bath” qubits, followed by reset of the bath qubits. The gate parameters within each cycle are optimized such that the steady state achieved after many cycles has a low energy expectation value with respect to the target Hamiltonian, and that the energy converges toward the steady state value in as few cycles as possible. We illustrate the protocol for the transverse field Ising model, and study its systematic behaviors with respect to system size, model parameters, and noise using tensor network based classical simulations. We then experimentally demonstrate its operation on IBM’s ibm_kingston quantum processor for up to 28 system qubits coupled to 14 bath sites. Classical training on small system sizes and with few unitary layers per cycle gives robust results that transfer well to larger system sizes and to noisy hardware.\n\n
URL:https://iqus.uw.edu/events/mark-rudner-april2026/
ORGANIZER;CN=Xiaojun Yao:MAILTO:xjyao@uw.edu
CATEGORIES:Seminars
LOCATION:C421 Physics and Astronomy Building
ATTACH;FMTTYPE=image/jpeg:https://iqus.uw.edu/wp-content/uploads/2024/02/Mark_Rudner5-1280.jpeg
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