Quantum control of the environment in open quantum systems enables rapid qubit reset

• URL: http://arxiv.org/abs/2603.09913v1
• Date: Tue, 10 Mar 2026 17:09:09 GMT
• Title: Quantum control of the environment in open quantum systems enables rapid qubit reset
• Abstract summary: Qubit reset is crucial in quantum technology and is typically achieved by coupling the qubit to a dissipative environment.<n>We show that they are due to the formation of a polaron state and how this can be reversed using a time-dependent coupling.<n> Coupling protocols are identified which achieve reset with an excited-state population of $10-6$ in $10$ ns.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Qubit reset is crucial in quantum technology and is typically achieved by coupling the qubit to a dissipative environment. However, the achievable speed and fidelity are limited by qubit-environment entanglement. We use exact tensor-network simulations and a time-dependent variational approach to investigate these effects for transmon qubits with a time-dependent system-environment coupling. We show that they are due to the formation of a polaron state and how this can be reversed using a time-dependent coupling. Coupling protocols are identified which achieve reset with an excited-state population of $10^{-6}$ in $10$ ns. A related paper [C. Ortega-Taberner, E. O'Neill and P. R. Eastham, arXiv:XXXX.XXXX] addresses the complementary case of control via a time-dependent Hamiltonian. Our work shows how the dynamics of the environment of an open quantum system can be controlled to design effective quantum processes in non-Markovian systems.

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