Quantum control of the environment in open quantum systems enables rapid qubit reset
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866912959471550464 |
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| author | Ortega-Taberner, Carlos O'Neill, Eoin Eastham, Paul |
| author_facet | Ortega-Taberner, Carlos O'Neill, Eoin Eastham, Paul |
| contents | 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. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2603_09913 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Quantum control of the environment in open quantum systems enables rapid qubit reset Ortega-Taberner, Carlos O'Neill, Eoin Eastham, Paul Quantum Physics Statistical Mechanics 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. |
| title | Quantum control of the environment in open quantum systems enables rapid qubit reset |
| topic | Quantum Physics Statistical Mechanics |
| url | https://arxiv.org/abs/2603.09913 |