Ultrafast, all-optical coherence of molecular electron spins in room-temperature, aqueous solution
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arXiv
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| Hauptverfasser: | , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866914889759457280 |
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| author | Sutcliffe, Erica Kazmierczak, Nathanael P. Hadt, Ryan G. |
| author_facet | Sutcliffe, Erica Kazmierczak, Nathanael P. Hadt, Ryan G. |
| contents | The tunability and spatial precision of paramagnetic molecules makes them attractive for quantum sensing. However, usual microwave-based detection methods have poor temporal and spatial resolution, and optical methods compatible with room-temperature solutions have remained elusive. Here, we utilize pump-probe polarization spectroscopy to initialize and track electron spin coherence in a molecule. Designed to efficiently couple spins to light, aqueous $K_{2}IrCl_{6}$ enables detection of few-picosecond free induction decay at room temperature and micromolar concentrations. Viscosity is found to strongly vary decoherence lifetimes. This work redefines the meaning of room-temperature coherence by improving experimental time resolution by up to five orders of magnitude. Doing so unveils a new regime of electron spin coherence, opening the door to new synthetic design and applications of molecular quantum bits. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_19032 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Ultrafast, all-optical coherence of molecular electron spins in room-temperature, aqueous solution Sutcliffe, Erica Kazmierczak, Nathanael P. Hadt, Ryan G. Quantum Physics The tunability and spatial precision of paramagnetic molecules makes them attractive for quantum sensing. However, usual microwave-based detection methods have poor temporal and spatial resolution, and optical methods compatible with room-temperature solutions have remained elusive. Here, we utilize pump-probe polarization spectroscopy to initialize and track electron spin coherence in a molecule. Designed to efficiently couple spins to light, aqueous $K_{2}IrCl_{6}$ enables detection of few-picosecond free induction decay at room temperature and micromolar concentrations. Viscosity is found to strongly vary decoherence lifetimes. This work redefines the meaning of room-temperature coherence by improving experimental time resolution by up to five orders of magnitude. Doing so unveils a new regime of electron spin coherence, opening the door to new synthetic design and applications of molecular quantum bits. |
| title | Ultrafast, all-optical coherence of molecular electron spins in room-temperature, aqueous solution |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2407.19032 |