Tunable ion–photon entanglement in an optical cavity
Open accessAbstract
Proposed quantum networks require both a quantum interface between light and matter and the coherent control of quantum states. A quantum interface can be realized by entangling the state of a single photon with the state of an atomic or solid-state quantum memory, as demonstrated in recent experiments with trapped ions, neutral atoms, atomic ensembles and nitrogen-vacancy spins. The entangling interaction couples an initial quantum memory state to two possible light-matter states, and the atomic level structure of the memory determines the available coupling paths. In previous work, the transition parameters of these paths determined the phase and amplitude of the final entangled state, unless the memory was initially prepared in a superposition state (a step that requires coherent control). Here we report fully tunable entanglement between a single (40)Ca(+) ion and the polarization state of a single photon within an optical resonator. Our method, based on a bichromatic, cavity-mediated Raman transition, allows us to select two coupling paths and adjust their relative phase and amplitude. The cavity setting enables intrinsically deterministic, high-fidelity generation of any two-qubit entangled state. This approach is applicable to a broad range of candidate systems and thus is a promising method for distributing information within quantum networks.
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The photon generation method based on a cavity-mediated Raman process provides tunable entangled states and high efficiency, which are advantageous for establishing long-distance entanglement.
“our photon generation method is based on a cavity-mediated Raman process providing tunable entangled states [34] and high efficiency [35], which are advantageous for establishing long-distance entanglement [36].”
From Entanglement of Trapped-Ion Qubits Separated by 230 Meters (2023) · cites this paper as [34]
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Self-citation
- Authors
- Stute, A., Casabone, B., Schindler, P., Monz, T., Schmidt, P. O., Brandstätter, B., Northup, T. E., & Blatt, R.
- Affiliations
- Universität Innsbruck (AT)
- Leibniz University Hannover (DE)
- Austrian Academy of Sciences (AT)
- Corresponding author
- Northup, T. E.
- Venue
- Nature
- Published
- 2012-05
- Volume
- 485
- Issue
- 7399
- Pages
- 482-485
- ISSN
- 0028-0836 (ISSN-L)
- 1476-4687
- PMC
- PMC4337972
- OpenAlex
- W2001341063
- Cited by
- 243
- References
- 39
- Citations by year
- 2026: 12 · 2025: 14 · 2024: 17 · 2023: 20 · 2022: 17 · 2021: 13 · 2020: 14 · 2019: 11 · 2018: 15 · 2017: 22 · 2016: 20 · 2015: 12 · 2014: 19 · 2013: 28 · 2012: 9
- FWCI
- 21.42
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Licence
- www.springer.com/tdm (tdm)
- Locations
- Nature (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- arXiv (Cornell University) (submittedVersion)
- RePEc: Research Papers in Economics (submittedVersion)
- arXiv (Cornell University)
- Topics
- Physical Sciences › Computer Science › Artificial Intelligence › Quantum Information and Cryptography
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum optics and atomic interactions
- Physical Sciences › Physics and Astronomy › Atomic and Molecular Physics, and Optics › Quantum Mechanics and Applications
- Keywords
- ion-photon entanglement, calcium-40 ions, trapped ions, single-photon polarization, optical resonators, quantum interface, quantum memory, two-qubit entangled states, quantum networks, quantum communication
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