Negative Wigner function by decaying interaction from equilibrium
Bosonic systems with negative Wigner function superposition states are fundamentally witnessing nonlinear quantum dynamics beyond linearized systems and, recently, have become essential resources of quantum technology with many applications. Typically, they appear due to sophisticated combination of...
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| Format: | Article |
| Language: | English |
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Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften
2024-12-01
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| Series: | Quantum |
| Online Access: | https://quantum-journal.org/papers/q-2024-12-17-1566/pdf/ |
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| _version_ | 1846115535301902336 |
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| author | Michal Kolář Radim Filip |
| author_facet | Michal Kolář Radim Filip |
| author_sort | Michal Kolář |
| collection | DOAJ |
| description | Bosonic systems with negative Wigner function superposition states are fundamentally witnessing nonlinear quantum dynamics beyond linearized systems and, recently, have become essential resources of quantum technology with many applications. Typically, they appear due to sophisticated combination of external drives, nonlinear control, measurements or strong nonlinear dissipation of subsystems to an environment. Here, we propose a conceptually different and more autonomous way to obtain such states, avoiding these ingredients, using purely sudden interaction decay in the paradigmatic interacting qubit-oscillator system weakly coupled to bath at thermal equilibrium in a low-temperature limit. We demonstrate simultaneously detectable unconditional negative Wigner function and quantum coherence and their qualitative enhancement employing more qubits. |
| format | Article |
| id | doaj-art-798dcc31bef948c9aeedd458cb553d9f |
| institution | Kabale University |
| issn | 2521-327X |
| language | English |
| publishDate | 2024-12-01 |
| publisher | Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften |
| record_format | Article |
| series | Quantum |
| spelling | doaj-art-798dcc31bef948c9aeedd458cb553d9f2024-12-19T11:59:15ZengVerein zur Förderung des Open Access Publizierens in den QuantenwissenschaftenQuantum2521-327X2024-12-018156610.22331/q-2024-12-17-156610.22331/q-2024-12-17-1566Negative Wigner function by decaying interaction from equilibriumMichal KolářRadim FilipBosonic systems with negative Wigner function superposition states are fundamentally witnessing nonlinear quantum dynamics beyond linearized systems and, recently, have become essential resources of quantum technology with many applications. Typically, they appear due to sophisticated combination of external drives, nonlinear control, measurements or strong nonlinear dissipation of subsystems to an environment. Here, we propose a conceptually different and more autonomous way to obtain such states, avoiding these ingredients, using purely sudden interaction decay in the paradigmatic interacting qubit-oscillator system weakly coupled to bath at thermal equilibrium in a low-temperature limit. We demonstrate simultaneously detectable unconditional negative Wigner function and quantum coherence and their qualitative enhancement employing more qubits.https://quantum-journal.org/papers/q-2024-12-17-1566/pdf/ |
| spellingShingle | Michal Kolář Radim Filip Negative Wigner function by decaying interaction from equilibrium Quantum |
| title | Negative Wigner function by decaying interaction from equilibrium |
| title_full | Negative Wigner function by decaying interaction from equilibrium |
| title_fullStr | Negative Wigner function by decaying interaction from equilibrium |
| title_full_unstemmed | Negative Wigner function by decaying interaction from equilibrium |
| title_short | Negative Wigner function by decaying interaction from equilibrium |
| title_sort | negative wigner function by decaying interaction from equilibrium |
| url | https://quantum-journal.org/papers/q-2024-12-17-1566/pdf/ |
| work_keys_str_mv | AT michalkolar negativewignerfunctionbydecayinginteractionfromequilibrium AT radimfilip negativewignerfunctionbydecayinginteractionfromequilibrium |