Ultranarrow spectral line of the radiation in double qubit-cavity ultrastrong coupling system

• URL: http://arxiv.org/abs/2010.16060v3
• Date: Tue, 13 Jul 2021 02:20:09 GMT
• Title: Ultranarrow spectral line of the radiation in double qubit-cavity ultrastrong coupling system
• Authors: Teng Zhao, Shao-ping Wu, Guo-qing Yang, Guang-ming Huang, Gao-Xiang Li
• Abstract summary: We study the ultranarrow spectrum of a circuit QED system with two qubits ultrastrongly coupled to a single-mode cavity. We find that the physical origin for the spectral narrowing is the vacuum-induced quantum interference between two transition pathways.
• Score: 0.8819673391477036
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: The ultrastrongly coupling (USC) system has very important research significance in quantum simulation and quantum computing. In this paper, the ultranarrow spectrum of a circuit QED system with two qubits ultrastrongly coupled to a single-mode cavity is studied. In the regime of USC, the JC model breaks down and the counter-rotating terms in the quantum Rabi Hamiltonian leads to the level anti-crossing in the energy spectrum. Choosing a single-photon driving field at the point of avoided-level crossing, we can get an equivalent four-level dressed state model, in which the dissipation of the two intermediate states is only related to the qubits decay. Due to the electron shelving of these two metastable states, a narrow peak appears in the cavity emission spectrum. Furthermore, we find that the physical origin for the spectral narrowing is the vacuum-induced quantum interference between two transition pathways. And this interference effect couples the slowly decaying incoherent components of the density matrix into the equations of the sidebands. This result provides a possibility for the study of quantum interference effect in the USC system.

Related papers

• A dissipation-induced superradiant transition in a strontium cavity-QED system [0.0]
  In cavity quantum electrodynamics (QED), emitters and a resonator are coupled together to enable precise studies of quantum light-matter interactions. Here we provide an observation of the continuous superradiant phase transition predicted in the CRF model using an ensemble of ultracold $88$Sr atoms. Our observations are a first step towards finer control of driven-dissipative systems, which have been predicted to generate quantum states.
  arXiv  Detail & Related papers  (2024-08-20T18:00:00Z)
• 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)
• Band Gap Engineering and Controlling Transport Properties of Single Photons in Periodic and Disordered Jaynes-Cummings Arrays [0.0]
  We study the single photon transport properties in periodic and position-disordered Jaynes-Cummings arrays. In the disordered case, we find that the single photon transmission curves show the disappearance of band formation. The results of this work may find application in the study of quantum many-body effects in the optical domain.
  arXiv  Detail & Related papers  (2024-01-26T22:32:21Z)
• Limits for coherent optical control of quantum emitters in layered materials [49.596352607801784]
  coherent control of a two-level system is among the most essential challenges in modern quantum optics. We use a mechanically isolated quantum emitter in hexagonal boron nitride to explore the individual mechanisms which affect the coherence of an optical transition under resonant drive. New insights on the underlying physical decoherence mechanisms reveals a limit in temperature until which coherent driving of the system is possible.
  arXiv  Detail & Related papers  (2023-12-18T10:37:06Z)
• 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)
• Hyper-entanglement between pulse modes and frequency bins [101.18253437732933]
  Hyper-entanglement between two or more photonic degrees of freedom (DOF) can enhance and enable new quantum protocols. We demonstrate the generation of photon pairs hyper-entangled between pulse modes and frequency bins.
  arXiv  Detail & Related papers  (2023-04-24T15:43:08Z)
• Unconditional Wigner-negative mechanical entanglement with linear-and-quadratic optomechanical interactions [62.997667081978825]
  We propose two schemes for generating Wigner-negative entangled states unconditionally in mechanical resonators. We show analytically that both schemes stabilize a Wigner-negative entangled state that combines the entanglement of a two-mode squeezed vacuum with a cubic nonlinearity. We then perform extensive numerical simulations to test the robustness of Wigner-negative entanglement attained by approximate CPE states stabilized in the presence of thermal decoherence.
  arXiv  Detail & Related papers  (2023-02-07T19:00:08Z)
• Experimental Realization and Characterization of Stabilized Pair Coherent States [4.486044407450978]
  PCS is an interesting class of non-Gaussian continuous-variable entangled state. PCS is at the heart of a promising quantum error correction code: the pair cat code. We report an experimental demonstration of the pair coherent state of microwave photons in two superconducting cavities.
  arXiv  Detail & Related papers  (2022-09-23T15:24:25Z)
• 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)
• Superposition of two-mode squeezed states for quantum information processing and quantum sensing [55.41644538483948]
  We investigate superpositions of two-mode squeezed states (TMSSs) TMSSs have potential applications to quantum information processing and quantum sensing.
  arXiv  Detail & Related papers  (2021-02-01T18:09:01Z)
• Dirac-type nodal spin liquid revealed by refined quantum many-body solver using neural-network wave function, correlation ratio, and level spectroscopy [0.0]
  We show that a machine-learning method for quantum many-body systems has achieved state-of-the-art accuracy. This achievement demonstrates that the quantum-state representation using machine learning techniques is a promising tool for investigating grand challenges in quantum many-body physics.
  arXiv  Detail & Related papers  (2020-05-28T16:54:47Z)

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

This site does not guarantee the quality of this site (including all information) and is not responsible for any consequences.