Microwave susceptibility observation of interacting many-body Andreev states

Abstract

Electrostatic charging affects the many-body spectrum of Andreev states, yet its influence on their microwave properties has not been elucidated. We developed a circuit quantum electrodynamics probe that, in addition to transition spectroscopy, measures the microwave susceptibility of different states of a semiconductor nanowire weak link with a single dominant (spin-degenerate) Andreev level. We found that the microwave susceptibility does not exhibit a particle-hole symmetry, which we qualitatively explain as an influence of Coulomb interaction. Moreover, our state-selective measurement reveals a large, $\pi$-phase shifted contribution to the response common to all many-body states which can be interpreted as arising from a phase-dependent continuum in the superconducting density of states.

References in corpus (23)

• QuTiP 2: A Python framework for the dynamics of open quantum systems
• Circuit Quantum Electrodynamics
• Electrodynamics of Correlated Electron Materials
• Epitaxy of Semiconductor-Superconductor nanowires
• Supercurrent reversal in quantum dots
• Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
• Coherent manipulation of an Andreev spin qubit
• Critical Current 0-$\pi$ Transition in Designed Josephson Quantum Dot Junctions
• Continuous monitoring of a trapped, superconducting spin
• Singlet-doublet transitions of a quantum dot Josephson junction detected in a transmon circuit
• Transport Measurement of Andreev Bound States in a Kondo-Correlated Quantum Dot
• Andreev spin qubits in multichannel Rashba nanowires
• Bogoliubov Quasiparticles in Superconducting Qubits
• Manipulating the magnetic state of a carbon nanotube Josephson junction using the superconducting phase
• Suppressed Charge Dispersion via Resonant Tunneling in a Single-Channel Transmon
• Observation of vanishing charge dispersion of a nearly-open superconducting island
• Signatures of interactions in the Andreev spectrum of nanowire Josephson junctions
• Quantum-Dot Parity Effects in Trivial and Topological Josephson Junctions
• Circuit-QED with phase-biased Josephson weak links
• Study of 0-$\pi$ phase transition in hybrid superconductor-InSb nanowire quantum dot devices
• From adiabatic to dispersive readout of quantum circuits
• Microwave response of an Andreev bound state
• Phase-dependent microwave response of a graphene Josephson junction