Protecting collective qubits from non-Markovian dephasing
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arXiv
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| Main Authors: | , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866912692180090880 |
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| author | Covolo, Antoine Magro, Valentin Girard, Mathieu Garcia, Sébastien Ourjoumtsev, Alexei |
| author_facet | Covolo, Antoine Magro, Valentin Girard, Mathieu Garcia, Sébastien Ourjoumtsev, Alexei |
| contents | Collectively-encoded qubits, involving ensembles of atomic or solid-state emitters, present many practical advantages for quantum technologies. However, they suffer from uncontrolled inhomogeneous dephasing which couples them to a quasi-continuum of dark states. In most cases, this process cannot be encompassed in a standard master equation with time-independent coefficients, making its description either tedious or inaccurate. We show that it can be understood as a displacement in time-frequency phase space and accurately included in resource-efficient numerical simulations of the qubit's dynamics. This description unveils a regime where the qubit becomes protected from dephasing through a combination of strong driving and non-Markovianity. We experimentally investigate this regime using a Rydberg superatom and extend its coherent dynamics beyond the inhomogeneous-dephasing characteristic time by an order of magnitude. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_07232 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Protecting collective qubits from non-Markovian dephasing Covolo, Antoine Magro, Valentin Girard, Mathieu Garcia, Sébastien Ourjoumtsev, Alexei Quantum Physics Atomic Physics Collectively-encoded qubits, involving ensembles of atomic or solid-state emitters, present many practical advantages for quantum technologies. However, they suffer from uncontrolled inhomogeneous dephasing which couples them to a quasi-continuum of dark states. In most cases, this process cannot be encompassed in a standard master equation with time-independent coefficients, making its description either tedious or inaccurate. We show that it can be understood as a displacement in time-frequency phase space and accurately included in resource-efficient numerical simulations of the qubit's dynamics. This description unveils a regime where the qubit becomes protected from dephasing through a combination of strong driving and non-Markovianity. We experimentally investigate this regime using a Rydberg superatom and extend its coherent dynamics beyond the inhomogeneous-dephasing characteristic time by an order of magnitude. |
| title | Protecting collective qubits from non-Markovian dephasing |
| topic | Quantum Physics Atomic Physics |
| url | https://arxiv.org/abs/2501.07232 |