A5023701833- Quantum Information and Cryptography
- Cold Atom Physics and Bose-Einstein Condensates
- Quantum and electron transport phenomena
- Quantum Mechanics and Applications
- Quantum optics and atomic interactions
- Quantum Computing Algorithms and Architecture
- Mechanical and Optical Resonators
Chalmers University of Technology
2020-2021
We experimentally investigate a superconducting qubit coupled to the end of an open transmission line, in regime where decay rates line and its own environment are comparable. perform measurements coherent incoherent scattering, on- off-resonant fluorescence, time-resolved dynamics determine decoherence qubit. In particular, these let us discriminate between non-radiative pure dephasing. combine contrast results across all methods find consistent values for extracted rates. The show that...
The interaction between superconducting qubits and one-dimensional microwave transmission lines has been studied experimentally theoretically in the past two decades. In this work, we investigate spontaneous emission of an initially excited artificial atom which is capacitively coupled to a semi-infinite line, shorted at one end. This configuration can be viewed as front mirror. distance mirror introduces time delay system, take into account fully. When equals integer number oscillation...
In this paper, we investigate the dynamics of a single superconducting artificial atom capacitively coupled to transmission line with characteristic impedance comparable or larger than quantum resistance. regime, microwaves are reflected from also at frequencies far atom's transition frequency. Adding mirror in then creates cavity modes between and mirror. Investigating spontaneous emission atom, find Rabi oscillations, where energy oscillates one modes.Received 8 December 2020Accepted 11...
We investigate three types of amplification processes for light fields coupling to an atom near the end a one-dimensional semi-infinite waveguide. consider two setups where drive creates population inversion in bare or dressed basis three-level and one setup is due higher-order driven two-level atom. In all cases, waveguide acts as mirror light. find that this enhances ways compared same open Firstly, forces output from travel direction instead being split up into channels. Secondly,...
We investigate the amplification of a microwave probe signal by superconducting artificial atom, transmon, strongly coupled to end one-dimensional semi-infinite transmission line. The line acts as mirror for fields. Due weak anharmonicity strong pump field creates multi-photon excitations among dressed states. Transitions between these states, Rabi sidebands, give rise either or attenuation probe. obtain maximum amplitude about 18 %, higher than in any previous experiment with single due...
We investigate three types of amplification processes for light fields coupling to an atom near the end a one-dimensional semi-infinite waveguide. consider two setups where drive creates population inversion in bare or dressed basis three-level and one setup is due higher-order driven two-level atom. In all cases, waveguide acts as mirror light. find that this enhances ways compared same open Firstly, forces output from travel direction instead being split up into channels. Secondly,...