Title: Autonomous quantum refrigerator resets superconducting qubit Speaker: Jose Antonio Marin Guzman (QuICS) Date & Time: February 7, 2025, 12:00pm Where to Attend: ATL 2400
In this talk, I present an experimental realization of a quantum absorption refrigerator formed from superconducting circuits. The refrigerator is used to reset a transmon qubit to a temperature lower than that achievable with any one available bath. The process is driven by a thermal gradient and is autonomous -- requires no external control. The refrigerator exploits an engineered three-body interaction between the target qubit and two auxiliary qudits coupled to thermal environments, formed from microwave waveguides populated with thermal photons. If initially fully excited, the target qubit reaches a steady-state excited-level population of 3×10-4 ±2×10-4 (an effective temperature of 22 mK) in about 1.8 μs. This platform represents the first realization of an autonomous quantum machine that can fulfill a useful purpose in a quantum-computing platform, thus bringing practicality into quantum-thermodynamic technologies.