Phonon-Induced Decoherence in Color-Center Qubits

• URL: http://arxiv.org/abs/2305.05049v2
• Date: Thu, 25 Jan 2024 05:29:37 GMT
• Title: Phonon-Induced Decoherence in Color-Center Qubits
• Authors: Prajit Dhara, Saikat Guha
• Abstract summary: Electron spin states of solid-state defects are a leading quantum-memory candidate for quantum communications and computing. We derive the time dynamics of the density operator of an electron-spin qubit. We use our model to corroborate experimentally-measured decoherence rates.
• Score: 1.6280801141284873
• License: http://creativecommons.org/licenses/by-nc-sa/4.0/
• Abstract: Electron spin states of solid-state defects such as Nitrogen- and Silicon-vacancy {\em color centers} in diamond are a leading quantum-memory candidate for quantum communications and computing. Via open-quantum-systems modeling of spin-phonon coupling -- the major contributor of decoherence -- at a given temperature, we derive the time dynamics of the density operator of an electron-spin qubit. We use our model to corroborate experimentally-measured decoherence rates. We further derive the temporal decay of distillable entanglement in spin-spin entangled states heralded via photonic Bell-state measurements. Extensions of our model to include other decoherence mechanisms, e.g., undesired hyperfine couplings to the neighboring nuclear-spin environment, will pave the way to a rigorous predictive model for engineering artificial-atom qubits with desirable properties.

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