1. Controlling dephasing of coupled qubits via shared-bath coherence
- Author
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Hall, L. M. J., Sirkina, L. S., Morreau, A., Langbein, W., and Muljarov, E. A.
- Subjects
Condensed Matter - Mesoscale and Nanoscale Physics ,Quantum Physics - Abstract
The interaction of a quantum system with its environment limits qubit coherence times and restricts its utility in quantum information processing applications. In this Letter, we show that the decoherence of a coupled qubit system can be minimized, or even eliminated by exploiting the quantum coherence of the bath itself. We investigate the dephasing in a system of two spatially separated, electronically decoupled qubits, with direct or mediated coupling, interacting with a shared bath. For illustration we treat F\"orster or cavity-mediated coupling between semiconductor quantum dots interacting with acoustic phonons. Using the rigorous method of Trotter's decomposition with cumulant expansion, we demonstrate a reduction in the dephasing rates at specific distances. This control is a coherent effect of the shared bath and is absent for independent baths. It can be understood in terms of phonon-assisted transitions between the entangled qubit states of the coupled system., Comment: 6 pages, 4 figures
- Published
- 2024