Quantum Interactions of a Torsional Nanomechanical Resonator with a Single Spin

Ming Gao, Chun-Wang Wu, Zhi-Jiao Deng +4 more

Jan Gieseler, Arthur Safira, Aaron Kabcenell +2 more

Brian D’Urso, M V Gurudev Dutt, Shonali Dhingra +1 more

While the motions of macroscopic objects must ultimately be governed by quantum mechanics, the distinctive features of quantum mechanics can be hidden or washed out by thermal excitations and coupling to the environment. We propose a system consisting of a graphene nanomechanical oscillator (NMO) coupled with a single spin through a uniform external magnetic field, which could become the building block for a wide range of quantum nanomechanical devices. The choice of graphene as the NMO material is critical for minimizing the moment of inertia of the oscillator. The spin originates from a nitrogen-vacancy (NV) center in a diamond nanocrystal that is positioned on the NMO. This coupling results in quantum non-demolition (QND) measurements of the oscillator and spin states, enabling a bridge between the quantum and classical worlds for a simple readout of the NV center spin and observation of the discrete states of the NMO.

Clodoaldo Valverde, Ardiley Torres Avelar, B. Baseia

Li-gong Zhou, Ming Gao, Jinlin Peng +1 more

We study scalability of quantum computing based on nanomechanical resonators (NAMRs), including the consequences of the effective next-nearest-neighbor spin-spin couplings induced by the NAMRs, NAMR frequency errors, and NAMR-spin coupling errors on the scalability of quantum computing based on NAMRs. We show the fidelity change of the quantum operation due to these errors numerically. Switchable interactions between NAMRs can be achieved by adding control gates. Based on this modification, we present a method to perfectly avoid the next-nearest-neighbor spin-spin couplings and compensate for the negative effects due to the frequency errors and spin coupling errors.

Morgan J. Choi, Christian J. Pluchar, Wenhua He +2 more