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Entangling atomic spins with a Rydberg-dressed spin-flip blockade
Open accessAbstract
Controlling the quantum entanglement between parts of a many-body system is key to unlocking the power of quantum technologies such as quantum computation, high-precision sensing, and the simulation of many-body physics. The spin degrees of freedom of ultracold neutral atoms in their ground electronic state provide a natural platform for such applications thanks to their long coherence times and the ability to control them with magneto-optical fields. However, the creation of strong coherent coupling between spins has been challenging. Here we demonstrate a strong and tunable Rydberg-dressed interaction between spins of individually trapped caesium atoms with energy shifts of order 1 MHz in units of Planck’s constant. This interaction leads to a ground-state spin-flip blockade, whereby simultaneous hyperfine spin flips of two atoms are inhibited owing to their mutual interaction. We employ this spin-flip blockade to rapidly produce single-step Bell-state entanglement between two atoms with a fidelity ≥81(2)%. Tunable interactions in quantum many-body systems have practical applications in quantum technologies. The effective spin-dependent long-range interaction known as Rydberg dressing is now exploited to entangle a pair of ultracold neutral atoms.
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Citations
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Metadata
- Authors
- Jau, Y.-Y., Hankin, A. M., Keating, T., Deutsch, I. H., & Biedermann, G. W.
- Venue
- Nature Physics
- Published
- 2015-10-05
- Volume
- 12
- Issue
- 1
- Pages
- 71-74
- ISSN
- 1745-2473 (ISSN-L)
- 1745-2481
- OpenAlex
- W1501304262
- Cited by
- 366
- References
- 33
- FWCI
- 17.49
- Type
- journal article
- Language
- en
- Open access
- green
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