Coherent dipole–dipole coupling between two single Rydberg atoms at an electrically-tuned Förster resonance
By S. Ravets, H. Labuhn, D. Barredo, Lucas B'eguin, Thierry Lahaye, Antoine Browaeys. Nature Physics, 2014
172 citations recorded by the source corpus.
Rydberg atoms offer an avenue for quantum simulation of many-body problems, but evidence for the coherent nature of their interaction is indirect. An externally-tuned resonance now reveals coherent oscillations between two single Rydberg atoms. Resonant energy transfers, the non-radiative redistribution of an electronic excitation between two particles coupled by the dipole–dipole interaction, lie at the heart of a variety of phenomena1, notably photosynthesis. In 1948, Förster established the theory of fluorescence resonant energy transfer (FRET) between broadband, nearly-resonant donors and acceptors2. The 1/R6 scaling of the energy transfer rate, where R is the distance between particles, enabled widespread use of FRET as a ‘spectroscopic ruler’ for determining nanometric distances in biomolecules3. The underlying mechanism is a coherent dipolar coupling between particles, as recognized in the early days of quantum mechanics4, but this coherence has not been directly observed so far. Here we study, spectroscopically and in the time domain, the coherent, dipolar-induced exchange of excitations between two Rydberg atoms separated by up to 15 μm, and brought into resonance by applying an electric field. Coherent oscillation of the system between two degenerate pair states then occurs at a frequency scaling as 1/R3, the hallmark of resonant dipole–dipole interactions5. Our results not only demonstrate, at the fundamental level of two atoms, the basic mechanism underlying FRET, but also open exciting prospects for active tuning of strong, coherent interactions in quantum many-body systems.
Subfields: Atomic and Molecular Physics, and Optics
View Paper: https://www.semanticscholar.org/paper/a7c5f2f770de9284d495611bcb27133e10c9dbee
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In Atomic and Molecular Physics, and Optics
Citations in the corpus
- Quantum simulation and computing with Rydberg-interacting qubits (2020, background): “It can also be realized by shifting other pair states into Förster resonance using external electric fields 156,157 .”