Enhancing Spin-Phonon and Spin-Spin Interactions Using Linear Resources in a Hybrid Quantum System

Year: 2020

Type: article

Abstract: Hybrid spin-mechanical setups offer a versatile platform for quantum science and technology, but improving the spin-phonon as well as the spin-spin couplings of such systems remains a crucial challenge. Here, we propose and analyze an experimentally feasible and simple method for exponentially enhancing the spin-phonon and the phonon-mediated spin-spin interactions in a hybrid spin-mechanical setup, using only linear resources. Through modulating the spring constant of the mechanical cantilever with a time-dependent pump, we can acquire a tunable and nonlinear (two-phonon) drive to the mechanical mode, thus amplifying the mechanical zero-point fluctuations and directly enhancing the spin-phonon coupling. This method allows the spin-mechanical system to be driven from the weak-coupling regime to the strong-coupling regime, and even the ultrastrong coupling regime. In the dispersive regime, this method gives rise to a large enhancement of the phonon-mediated spin-spin interactions between distant solid-state spins, typically two orders of magnitude larger than that without modulation. As an example, we show that the proposed scheme can apply to generating entangled states of multiple spins with high fidelities even in the presence of large dissipations.

Source: Physical Review Letters

DOI: 10.1103/physrevlett.125.153602

Authors: Peng-Bo Li, Yuan Zhou, Wei-Bo Gao, Franco Nori

Institutions: RIKEN, Xi'an Jiaotong University, Nanyang Technological University, Hubei University of Automotive Technology, University of Michigan

Language: English

Topic: Mechanical and Optical Resonators

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: green

Funders: Foundational Questions Institute, National Institute of Advanced Industrial Science and Technology, Asian Office of Aerospace Research and Development, National Natural Science Foundation of China, Russian Foundation for Basic Research, Fonds Wetenschappelijk Onderzoek, Natural Science Foundation of Hubei Province, Hubei University of Automotive Technology, Multidisciplinary University Research Initiative, Japan Society for the Promotion of Science, Japan Science and Technology Agency, RIKEN, Core Research for Evolutional Science and Technology, Air Force Office of Scientific Research, Army Research Office

OpenAlex ID: W3011858155