A Nanomechanical Atomic Force Qubit

TL;DR

This paper proposes a novel silicon nanomechanical qubit using atomic forces, enabling quantum control without ancillary qubits, with potential applications in quantum information processing.

Contribution

It introduces a new approach to realize a silicon nanomechanical qubit via atomic forces, eliminating the need for ancillary qubits and enabling quantum nonlinear phononics.

Findings

Qubit operates at 60 MHz with 5 MHz anharmonicity

Ultrahigh mechanical quality factors achieved

Potential for quantum information processing and transduction

Abstract

Silicon nanomechanical resonators display ultra-long lifetimes at cryogenic temperatures and microwave frequencies. Achieving quantum control of single-phonons in these devices has so far relied on nonlinearities enabled by coupling to ancillary qubits. In this work, we propose using atomic forces to realize a silicon nanomechanical qubit without coupling to an ancillary qubit. The proposed qubit operates at 60 MHz with a single-phonon level anharmonicity of 5 MHz. We present a circuit quantum acoustodynamics architecture where electromechanical resonators enable dispersive state readout and multi-qubit operations. The combination of strong anharmonicity, ultrahigh mechanical quality factors, and small footprints achievable in this platform could enable quantum-nonlinear phononics for quantum information processing and transduction.