Quantum acoustic Fano interference of surface phonons

Abstract

Quantum acoustic systems, which integrate surface or bulk phonons with superconducting qubits, offer a unique opportunity to investigate phononic $interference$ and $scattering$ processes in the quantum regime. In particular the interaction between a superconducting qubit and a phononic oscillator allows the qubit to sense the oscillator's excitation spectrum and underlying interference effects. Here we present measurements revealing Fano interference of a resonantly trapped piezoelectric surface acoustic wave (SAW) mode with a broad continuum of surface phonons in a system consisting of a SAW resonator coupled to a superconducting qubit. The experiments highlight the existence of additional weakly coupled mechanical modes and their influence on the qubit-phonon interaction and underscore the importance of phononic interference in quantum acoustic architectures that have been proposed for quantum information processing applications.

7 pages, 5 figures. Updated title and abstract

References in corpus (8)

• Charge insensitive qubit design derived from the Cooper pair box
• Resolving photon number states in a superconducting circuit
• Controlling the spontaneous emission of a superconducting transmon qubit
• AC-Stark Shift and Dephasing of a Superconducting Qubit Strongly Coupled to a Cavity Field
• Qubit-photon interactions in a cavity: Measurement induced dephasing and number splitting
• Phonon-mediated quantum state transfer and remote qubit entanglement
• Developing a platform for linear mechanical quantum computing
• Quantum communication with itinerant surface acoustic wave phonons

Cited by in corpus (2)

• Decoherence of surface phonons in a quantum acoustic system
• Frequency-modulated enhancement of microwave resonator sensing