2015/09/11 by L. Sárkány, Lőrinc Sárkány, József Fortágh +1
Computer Science · Physics and Astronomy · #Atomic physics #Cavity quantum electrodynamics #Cold Atom Physics and Bose-Einstein Condensates #Excited state #Ionization #Mesoscopic physics #Microwave #Microwave cavity #Open quantum system #Photon #Physics #Principal quantum number #Quantum #Quantum Information and Cryptography #Quantum dissipation #Quantum entanglement #Quantum gate #Quantum information #Quantum mechanics #Quantum optics and atomic interactions #Rydberg atom #Rydberg formula #quant-ph
paper · pdf · doi:10.1103/physreva.92.030303
published as Phys. Rev. A 92, 030303(R) (2015)
arxiv created 2015/09/11 · openalex publication_date 2015/09/21 · arxiv updated 2015/09/24 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
We propose an implementation of a universal quantum gate between pairs of spatially separated atoms in a microwave cavity at finite temperature. The gate results from reversible laser excitation of Rydberg states of atoms interacting with each other via exchange of virtual photons through a common cavity mode. Quantum interference of different transition paths between the two-atom ground and double-excited Rydberg states makes both the transition amplitude and resonance largely insensitive to the excitations in the microwave cavity quantum bus which can therefore be in any superposition or mixture of photon number states. Our scheme for attaining ultra-long-range interactions and entanglement also applies to mesoscopic atomic ensembles in the Rydberg blockade regime and is scalable to many ensembles trapped within a centimeter-sized microwave resonator.