Related papers: One photon simultaneously excites two atoms in a ultrastrongly coupled light-matter system

One photon simultaneously excites two atoms in a ultrastrongly coupled light-matter system

URL: http://arxiv.org/abs/2307.15437v2
Date: Fri, 5 Jan 2024 03:10:25 GMT
Title: One photon simultaneously excites two atoms in a ultrastrongly coupled light-matter system
Authors: Akiyoshi Tomonaga, Roberto Stassi, Hiroto Mukai, Franco Nori, Fumiki Yoshihara, and Jaw-Shen Tsai
Abstract summary: We experimentally investigate a superconducting circuit composed of two flux qubits ultrastrongly coupled to a common $LC$ resonator. This enables novel processes for quantum-information processing tasks on a chip.
Score: 0.0
License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
Abstract: We experimentally investigate a superconducting circuit composed of two flux qubits ultrastrongly coupled to a common $LC$ resonator. Owing to the large anharmonicity of the flux qubits, the system can be correctly described by a generalized Dicke Hamiltonian containing spin-spin interaction terms. In the experimentally measured spectrum, an avoided level crossing provides evidence of the exotic interaction that allows the \textit{simultaneous} excitation of \textit{two} artificial atoms by absorbing \textit{one} photon from the resonator. This multi-atom ultrastrongly coupled system opens the door to studying nonlinear optics where the number of excitations is not conserved. This enables novel processes for quantum-information processing tasks on a chip.

Related papers

Nonlinear dynamical Casimir effect and Unruh entanglement in waveguide QED with parametrically modulated coupling [83.88591755871734]
We study theoretically an array of two-level qubits moving relative to a one-dimensional waveguide. When the frequency of this motion approaches twice the qubit resonance frequency, it induces parametric generation of photons and excitation of the qubits. We develop a comprehensive general theoretical framework that incorporates both perturbative diagrammatic techniques and a rigorous master-equation approach.
arXiv Detail & Related papers (2024-08-30T15:54:33Z)
Dynamics and Resonance Fluorescence from a Superconducting Artificial Atom Doubly Driven by Quantized and Classical Fields [11.961708412157757]
Experimental demonstration of resonance fluorescence in a two-level superconducting artificial atom under two driving fields coupled to a detuned cavity. The device consists of a transmon qubit strongly coupled to a one-dimensional transmission line and a coplanar waveguide resonator.
arXiv Detail & Related papers (2024-03-17T08:48:30Z)
Violation of Bell inequality by photon scattering on a two-level emitter [4.810881229568956]
Entanglement, the non-local correlations present in quantum systems, is a curious feature of quantum mechanics and the fuel of quantum technology. We show how a single two-level emitter deterministically coupled to light in a nanophotonic waveguide is used to realize genuine photonic quantum entanglement for excitation at the single photon level.
arXiv Detail & Related papers (2023-06-22T11:01:24Z)
Dissipative stabilization of maximal entanglement between non-identical emitters via two-photon excitation [49.1574468325115]
Two non-identical quantum emitters, when placed within a cavity and coherently excited at the two-photon resonance, can reach stationary states of nearly maximal entanglement. We show that this mechanism is merely one among a complex family of phenomena that can generate both stationary and metastable entanglement when driving the emitters at the two-photon resonance.
arXiv Detail & Related papers (2023-06-09T16:49:55Z)
Resonance fluorescence of a chiral artificial atom [0.28675177318965034]
We demonstrate a superconducting artificial atom with strong unidirectional coupling to a microwave photonic waveguide. Our demonstration puts forth a superconducting hardware platform for the realization of several key functionalities pursued within the paradigm of chiral quantum optics.
arXiv Detail & Related papers (2022-12-21T22:59:43Z)
Resolving Fock states near the Kerr-free point of a superconducting resonator [51.03394077656548]
We have designed a tunable nonlinear resonator terminated by a SNAIL (Superconducting Asymmetric Inductive eLement) We have excited photons near this Kerr-free point and characterized the device using a transmon qubit.
arXiv Detail & Related papers (2022-10-18T09:55:58Z)
Probing the symmetry breaking of a light--matter system by an ancillary qubit [50.591267188664666]
Hybrid quantum systems in the ultrastrong, and even more in the deep-strong, coupling regimes can exhibit exotic physical phenomena. We experimentally observe the parity symmetry breaking of an ancillary Xmon artificial atom induced by the field of a lumped-element superconducting resonator. This result opens a way to experimentally explore the novel quantum-vacuum effects emerging in the deep-strong coupling regime.
arXiv Detail & Related papers (2022-09-13T06:14:08Z)
Photon generation and entanglement in a double superconducting cavity [105.54048699217668]
We study the dynamical Casimir effect in a double superconducting cavity in a quantum electrodynamics architecture. We study the creation of photons when the walls oscillate harmonically with a small amplitude.
arXiv Detail & Related papers (2022-07-18T16:43:47Z)
Observation of oscillatory Raman gain associated with two-photon Rabi oscillations of nanofiber-coupled atoms [0.0]
Quantum emitters with a $Lambda$-type level structure enable numerous protocols and applications in quantum science and technology. Here, we drive two-photon Rabi oscillations between the two ground states of cesium atoms. We study the dependence of the two-photon Rabi frequency on the system parameters and observe Autler-Townes splitting in the probe transmission spectrum.
arXiv Detail & Related papers (2022-07-01T13:59:26Z)
Waveguide Bandgap Engineering with an Array of Superconducting Qubits [101.18253437732933]
We experimentally study a metamaterial made of eight superconducting transmon qubits with local frequency control. We observe the formation of super- and subradiant states, as well as the emergence of a polaritonic bandgap. The circuit of this work extends experiments with one and two qubits towards a full-blown quantum metamaterial.
arXiv Detail & Related papers (2020-06-05T09:27:53Z)

This list is automatically generated from the titles and abstracts of the papers in this site.