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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2406.03389 |
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| _version_ | 1866910904674680832 |
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| author | Yang, Ian Agrenius, Thomas Usova, Vasilisa Romero-Isart, Oriol Kirchmair, Gerhard |
| author_facet | Yang, Ian Agrenius, Thomas Usova, Vasilisa Romero-Isart, Oriol Kirchmair, Gerhard |
| contents | The observation of quantum phenomena often necessitates sufficiently pure states, a requirement that can be challenging to achieve. In this study, our goal is to prepare a non-classical state originating from a mixed state, utilizing dynamics that preserve the initial low purity of the state. We generate a quantum superposition of displaced thermal states within a microwave cavity using only unitary interactions with a transmon qubit. We measure the Wigner functions of these ``hot'' Schrödinger cat states for an initial purity as low as 0.06. This corresponds to a cavity mode temperature of up to 1.8 Kelvin, sixty times hotter than the cavity's physical environment. Our realization of highly mixed quantum superposition states could be implemented with other continuous-variable systems e.g. nanomechanical oscillators, for which ground-state cooling remains challenging. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2406_03389 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Hot Schrödinger Cat States Yang, Ian Agrenius, Thomas Usova, Vasilisa Romero-Isart, Oriol Kirchmair, Gerhard Quantum Physics The observation of quantum phenomena often necessitates sufficiently pure states, a requirement that can be challenging to achieve. In this study, our goal is to prepare a non-classical state originating from a mixed state, utilizing dynamics that preserve the initial low purity of the state. We generate a quantum superposition of displaced thermal states within a microwave cavity using only unitary interactions with a transmon qubit. We measure the Wigner functions of these ``hot'' Schrödinger cat states for an initial purity as low as 0.06. This corresponds to a cavity mode temperature of up to 1.8 Kelvin, sixty times hotter than the cavity's physical environment. Our realization of highly mixed quantum superposition states could be implemented with other continuous-variable systems e.g. nanomechanical oscillators, for which ground-state cooling remains challenging. |
| title | Hot Schrödinger Cat States |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2406.03389 |