Long-range quantum gate via Rydberg states of atoms in a thermal microwave cavity

Abstract

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 ultralong-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.

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• Optimized Geometric Quantum Computation with mesoscopic ensemble of Rydberg Atoms
• Rydberg superatoms: An artificial quantum system for quantum information processing and quantum optics
• Coupling Rydberg atoms to microwave fields in a superconducting coplanar waveguide resonator
• Nonadiabatic holonomic quantum computation with Rydberg superatoms
• Absolute frequency measurement of rubidium 5S-6P transitions
• Single temporal-pulse-modulated parameterized controlled-phase gate for Rydberg atoms
• Superconducting Resonator-Rydberg Atom Hybrid in the Strong Coupling Regime
• Reducing the sensitivity of Rydberg atoms to dc electric fields using two-frequency ac field dressing
• Perspective on new implementations of atomtronic circuits
• Faithful state transfer between two-level systems via an actively cooled finite-temperature cavity
• Controlling the dipole blockade and ionization rate of Rydberg atoms in strong electric fields
• Reducing Rydberg state dc polarizability by microwave dressing
• Cavity-enhanced Ramsey spectroscopy at a Rydberg-atom-superconducting-circuit interface
• Simulation of a feedback-based algorithm for quantum optimization for a realistic neutral atom system with an optimized small-angle controlled-phase gate
• Quantum gates between distant atoms mediated by a Rydberg excitation antiferromagnet
• Optically Tailored Trapping Geometries for Ultracold Atoms on a Type-II Superconducting Chip
• Strong coupling and active cooling in a finite temperature hybrid atom-cavity system
• A superconducting on-chip microwave cavity for tunable hybrid systems with optically trapped Rydberg atoms
• Magic trapping of a Rydberg ion with a diminished static polarizability