Quantum spectral analysis by continuous measurement of Landau-Zener transitions
Fuente:
arXiv
Guardado en:
| Autores principales: | , , , , , , |
|---|---|
| Formato: | Preprint |
| Publicado: |
2023
|
| Materias: | |
| Acceso en línea: | |
| Etiquetas: |
Agregar Etiqueta
Sin Etiquetas, Sea el primero en etiquetar este registro!
|
| _version_ | 1866913245636329472 |
|---|---|
| author | Bounds, Christopher C. Duff, Josh P. Tritt, Alex Taylor, Hamish A. M. Coe, George X. White, Sam J. Turner, L. D. |
| author_facet | Bounds, Christopher C. Duff, Josh P. Tritt, Alex Taylor, Hamish A. M. Coe, George X. White, Sam J. Turner, L. D. |
| contents | We demonstrate the simultaneous estimation of signal frequency and amplitude by a single quantum sensor in a single experimental shot. Sweeping the qubit splitting linearly across a span of frequencies induces a non-adiabatic Landau-Zener transition as the qubit crosses resonance. The signal frequency determines the time of the transition, and the amplitude its extent. Continuous weak measurement of this unitary evolution informs a parameter estimator retrieving precision measurements of frequency and amplitude. Implemented on radiofrequency-dressed ultracold atoms read out by a Faraday spin-light interface, we sense a magnetic signal with $20~\text{pT}$ precision in amplitude, and near-transform-limited precision in frequency, in a single $300~\text{ms}$ sweep from $7$ to $13~\text{kHz}$. The protocol realizes a swept-sine quantum spectrum analyzer, potentially sensing hundreds or thousands of channels with a single quantum sensor. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2306_01622 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Quantum spectral analysis by continuous measurement of Landau-Zener transitions Bounds, Christopher C. Duff, Josh P. Tritt, Alex Taylor, Hamish A. M. Coe, George X. White, Sam J. Turner, L. D. Quantum Physics We demonstrate the simultaneous estimation of signal frequency and amplitude by a single quantum sensor in a single experimental shot. Sweeping the qubit splitting linearly across a span of frequencies induces a non-adiabatic Landau-Zener transition as the qubit crosses resonance. The signal frequency determines the time of the transition, and the amplitude its extent. Continuous weak measurement of this unitary evolution informs a parameter estimator retrieving precision measurements of frequency and amplitude. Implemented on radiofrequency-dressed ultracold atoms read out by a Faraday spin-light interface, we sense a magnetic signal with $20~\text{pT}$ precision in amplitude, and near-transform-limited precision in frequency, in a single $300~\text{ms}$ sweep from $7$ to $13~\text{kHz}$. The protocol realizes a swept-sine quantum spectrum analyzer, potentially sensing hundreds or thousands of channels with a single quantum sensor. |
| title | Quantum spectral analysis by continuous measurement of Landau-Zener transitions |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2306.01622 |