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Title: Enhancing spin-phonon and spin-spin interactions using linear resources in a hybrid quantum system
Authors: Li, Peng-Bo
Zhou, Yuan
Gao, Wei-Bo
Nori, Franco
Keywords: Science::Physics
Issue Date: 2020
Source: Li, P.-B., Zhou, Y., Gao, W.-B., & Nori, F. (2020). Enhancing spin-phonon and spin-spin interactions using linear resources in a hybrid quantum system. Physical Review Letters, 125(15), 153602-. doi:10.1103/PhysRevLett.125.153602
Journal: Physical Review Letters
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.
ISSN: 0031-9007
DOI: 10.1103/PhysRevLett.125.153602
Schools: School of Physical and Mathematical Sciences 
Rights: © 2020 American Physical Society. All rights reserved. This paper was published in Physical Review Letters and is made available with permission of American Physical Society.
Fulltext Permission: open
Fulltext Availability: With Fulltext
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