Cavity polariton in a quasi-lattice of qubits and its selective radiation

Abstract

In a circuit quantum eletrodynamic system, a chain of N qubits inhomogeneously coupled to a cavity field forms a mesoscopic quasi-lattice, which is characterized by its degree of deformation from a normal lattice. This deformation is a function of the relative spacing, that is the ratio of the qubit spacing to the cavity wavelength. A polariton mode arise in the quasi-lattice as the dressed mode of the lattice excitation by the cavity photon. We show that the transition probability of the polariton mode is either enhanced or decreased compared to that of a single qubit by the deformation, giving a selective spontaneous radiation spectrum. Further, unlike a microscopic lattice with large-N limit and nearly zero relative spacing, the polariton in the quasi-lattice has uneven decay rate over the relative spacing. We show that this unevenness coincides with the cooperative emission effect expected from the superradiance model, where alternative excitations in the qubits of the lattice result in maximum decay.

References in corpus (7)

• Coupling Superconducting Qubits via a Cavity Bus
• Dressed Collective Qubit States and the Tavis-Cummings Model in Circuit QED
• Is there a no-go theorem for superradiant quantum phase transitions in cavity and circuit QED ?
• Single artificial-atom lasing
• Light-matter decoupling in the deep strong coupling regime: The breakdown of the Purcell effect
• Microwave Photon Detector in Circuit QED
• Collective coherence in planar semiconductor microcavities

Cited by in corpus (3)

• Quasi-lattices of qubits for generating inequivalent multipartite entanglements
• Synchronization of two cavity-coupled qubits measured by entanglement
• Distributed entanglement generation from asynchronously excited qubits