Single-junction quantum-circuit refrigerator

Abstract

We propose a quantum-circuit refrigerator (QCR) based on photon-assisted quasiparticle tunneling through a single normal-metal--insulator--superconductor (NIS) junction. In contrast to previous works with multiple junctions and an additional charge island for the QCR, we galvanically connect the NIS junction to an inductively shunted electrode of a superconducting microwave resonator making the device immune to low-frequency charge noise. At low characteristic impedance of the resonator and parameters relevant to a recent experiment, we observe that a semiclassical impedance model of the NIS junction reproduces the bias voltage dependence of the QCR-induced damping rate and frequency shift. For high characteristic impedances, we derive a Born--Markov master equation and use it to observe significant non-linearities in the QCR-induced dissipation and frequency shift. We further demonstrate that in this regime, the QCR can be used to initialize the linear resonator into a non-thermal state even in the absence of any microwave drive.

5 pages, 3 figures

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Cited by in corpus (11)

• Quantum bath engineering of a high impedance microwave mode through quasiparticle tunneling
• Initial experimental results on a superconducting-qubit reset based on photon-assisted quasiparticle tunneling
• Exceptional-point-assisted entanglement, squeezing, and reset in a chain of three superconducting resonators
• Quantum-circuit refrigeration of a superconducting microwave resonator well below a single quantum
• Many-excitation removal of a transmon qubit using a single-junction quantum-circuit refrigerator and a two-tone microwave drive
• Nonlinear response theory for lossy superconducting quantum circuits
• Rapid on-demand generation of thermal states in superconducting quantum circuits
• Quantum circuit refrigerator based on quantum dots coupled to normal-metal and superconducting electrodes
• Photonic Negative Differential Thermal Conductance Enabled by NIS Junctions
• Dissipation and noise in strongly driven Josephson junctions
• Cooling of electrons via superconducting tunnel junctions and their arrays exhibiting nodal lines