Optomechanically induced selective emitter—emitter interactions for control of quantum networks

Quantum emitters such as point-defects (artificial atoms) in diamond [1] can be used as elementary building blocks (qubits) of quantum information systems. The function of a a quantum network, however, also relies on efficient qubit-qubit interactions and thus allowing for practical implementation of quantum gates. Here we suggest a coupling scheme where optically active qubits (e.g. artificial atoms in diamond) of different excitation frequencies are dispersively coupled to a shared mode of an optical cavity. The cavity induces an effective generally off-resonant qubit-qubit interaction [2] prohibiting direct exchange of information among these qubits. By applying coherent acoustical driving [3] to modulate the qubit frequencies it is possible to bring to resonance a desired subset of qubits and thus selectively open an inter-qubit communication channel. We theoretically demonstrate this principle by solving the quantum master equation both numerically and analytically and suggest practical experimental scenarios to test our predictions.

[1] Harris et al., arXiv:1907.12548 (2019)
[2] Evans et al., Science, 362 (6415), 662-665 (2018)
[3] Chen et al., Phys. Rev. Lett., 120, 167401 (2018)