Multi-qubit gates and Schrödinger cat states in an optical clock
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arXiv
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| Autori principali: | , , , , , , , , , , |
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| Natura: | Preprint |
| Pubblicazione: |
2024
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| _version_ | 1866917801569026048 |
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| author | Cao, Alec Eckner, William J. Yelin, Theodor Lukin Young, Aaron W. Jandura, Sven Yan, Lingfeng Kim, Kyungtae Pupillo, Guido Ye, Jun Oppong, Nelson Darkwah Kaufman, Adam M. |
| author_facet | Cao, Alec Eckner, William J. Yelin, Theodor Lukin Young, Aaron W. Jandura, Sven Yan, Lingfeng Kim, Kyungtae Pupillo, Guido Ye, Jun Oppong, Nelson Darkwah Kaufman, Adam M. |
| contents | Many-particle entanglement is a key resource for achieving the fundamental precision limits of a quantum sensor. Optical atomic clocks, the current state-of-the-art in frequency precision, are a rapidly emerging area of focus for entanglement-enhanced metrology. Augmenting tweezer-based clocks featuring microscopic control and detection with the high-fidelity entangling gates developed for atom-array information processing offers a promising route towards leveraging highly entangled quantum states for improved optical clocks. Here we develop and employ a family of multi-qubit Rydberg gates to generate Schrödinger cat states of the Greenberger-Horne-Zeilinger (GHZ) type with up to 9 optical clock qubits in a programmable atom array. In an atom-laser comparison at sufficiently short dark times, we demonstrate a fractional frequency instability below the standard quantum limit using GHZ states of up to 4 qubits. However, due to their reduced dynamic range, GHZ states of a single size fail to improve the achievable clock precision at the optimal dark time compared to unentangled atoms. Towards overcoming this hurdle, we simultaneously prepare a cascade of varying-size GHZ states to perform unambiguous phase estimation over an extended interval. These results demonstrate key building blocks for approaching Heisenberg-limited scaling of optical atomic clock precision. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_16289 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Multi-qubit gates and Schrödinger cat states in an optical clock Cao, Alec Eckner, William J. Yelin, Theodor Lukin Young, Aaron W. Jandura, Sven Yan, Lingfeng Kim, Kyungtae Pupillo, Guido Ye, Jun Oppong, Nelson Darkwah Kaufman, Adam M. Quantum Physics Quantum Gases Atomic Physics Many-particle entanglement is a key resource for achieving the fundamental precision limits of a quantum sensor. Optical atomic clocks, the current state-of-the-art in frequency precision, are a rapidly emerging area of focus for entanglement-enhanced metrology. Augmenting tweezer-based clocks featuring microscopic control and detection with the high-fidelity entangling gates developed for atom-array information processing offers a promising route towards leveraging highly entangled quantum states for improved optical clocks. Here we develop and employ a family of multi-qubit Rydberg gates to generate Schrödinger cat states of the Greenberger-Horne-Zeilinger (GHZ) type with up to 9 optical clock qubits in a programmable atom array. In an atom-laser comparison at sufficiently short dark times, we demonstrate a fractional frequency instability below the standard quantum limit using GHZ states of up to 4 qubits. However, due to their reduced dynamic range, GHZ states of a single size fail to improve the achievable clock precision at the optimal dark time compared to unentangled atoms. Towards overcoming this hurdle, we simultaneously prepare a cascade of varying-size GHZ states to perform unambiguous phase estimation over an extended interval. These results demonstrate key building blocks for approaching Heisenberg-limited scaling of optical atomic clock precision. |
| title | Multi-qubit gates and Schrödinger cat states in an optical clock |
| topic | Quantum Physics Quantum Gases Atomic Physics |
| url | https://arxiv.org/abs/2402.16289 |