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arXiv:1804.07862 · Physical Review X

Scaling Phononic Quantum Networks of Solid-State Spins with Closed Mechanical Subsystems

Mark C. Kuzyk, Hailin Wang

Published Nov 13, 2018• 86 citations

Abstract

Phononic quantum networks feature distinct advantages over photonic networks for on-chip quantum communications, providing a promising platform for developing quantum computers with robust solidstate spin qubits.Large mechanical networks including one-dimensional chains of trapped ions, however, have inherent and well-known scaling problems.In addition, chiral phononic processes, which are necessary for conventional phononic quantum networks, are difficult to implement in a solid-state system.To overcome these seemingly unsolvable obstacles, we have developed a new network architecture that breaks a large mechanical network into small and closed mechanical subsystems.This architecture is implemented in a diamond phononic nanostructure featuring alternating phononic crystal waveguides with specially designed band gaps.The implementation also includes nanomechanical resonators coupled to color centers through phonon-assisted transitions as well as quantum state transfer protocols that can be robust against the thermal environment.

DOI: 10.1103/physrevx.8.041027

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