A Microwave Josephson Refrigerator
Paolo Solinas, Riccardo Bosisio, Francesco Giazotto
TL;DR
This paper introduces a microwave quantum refrigeration method utilizing the Josephson effect in a SQUID, enabling active cooling of superconducting electrodes below lattice temperature for quantum technology applications.
Contribution
It proposes a novel microwave-based refrigeration principle using a SQUID with time-dependent magnetic flux, demonstrating a new cooling mechanism in superconducting circuits.
Findings
Effective cooling below lattice temperature demonstrated
Scalable and simple design suitable for quantum tech
Potential for integration into quantum devices
Abstract
We present a microwave quantum refrigeration principle based on the Josephson effect. When a superconducting quantum interference device (SQUID) is pierced by a time-dependent magnetic flux, it induces changes in the macroscopic quantum phase and an effective finite bias voltage appears across the SQUID. This voltage can be used to actively cool well below the lattice temperature one of the superconducting electrodes forming the interferometer. The achievable cooling performance combined with the simplicity and scalability intrinsic to the structure pave the way to a number of applications in quantum technology.
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