Charged particles can interact with each other, or feel the presence of other charged particles, through the Coulomb interaction. While such an interaction mechanism does not naturally exist for photons, it is well-known that a single atom placed inside of a cavity can mediate an interaction among photons inside of the cavity. The magnitude of this induced photon-photon interaction is often thought to monotonically increase as a function of the atom-photon interaction strength. Contrary to this belief, we show in our work that beyond a certain threshold value, the stronger atom-photon interaction starts to reduce the induced photon-photon interaction. This rather counter-intuitive property of the induced photon-photon interaction is discussed in the context of the photon population dynamics in a coupled cavity array where there occurs a double dynamical transition from a delocalization to localization, back to delocalization, of the photon population. Moreover, it is found that the second delocalization dynamics shows a quasi-equilibration despite of being a closed, finite quantum system.
- ITP and the Center of QuantumBioSciences is part of newly approved Collaborative Research Center 1279
- The work of the Institute was mentioned in The Economist
- Congratulations to Jorge Casanova for winning a “Forschungsbonus”!
- Summer BBQ
- The paper “Ultrasensitive magnetometer using a single atom” was selected as a PRL EDITORS’ SUGGESTION
Most Recent Papers
•Quantum – coherent dynamics in photosynthetic charge separation revealed by wavelet analysis, Nature Scientific Reports, 7, 2890 (2017)
•Submillihertz magnetic spectroscopy performed with a nanoscale quantum sensor, Science, 356, 832 (2017)
•Scheme for Detection of Single-Molecule Radical Pair Reaction Using Spin in Diamond, Physical Review Letters, 118, 200402 (2017)
Institute of Theoretical Physics
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