Demonstrating W-type Entanglement of Dicke-States in Resonant Cavity Quantum Electrodynamics

Abstract

Nonlinearity and entanglement are two important properties by which physical systems can be identified as non-classical. We study the dynamics of the resonant interaction of up to N=3 two-level systems and a single mode of the electromagnetic field sharing a single excitation dynamically. We observe coherent vacuum Rabi oscillations and their nonlinear speed up by tracking the populations of all qubits and the resonator in time. We use quantum state tomography to show explicitly that the dynamics generates maximally entangled states of the W class in a time limited only by the collective interaction rate. We use an entanglement witness and the threetangle to characterize the state whose fidelity F=78% is limited in our experiments by crosstalk arising during the simultaneous qubit manipulations which is absent in a sequential approach with F=91%.

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• Observation of the photon-blockade breakdown phase transition
• Generation and controllable switching of superradiant and subradiant states in a 10-qubit superconducting circuit
• Digital-Analog Quantum Simulations with Superconducting Circuits
• Observation of collective coupling between an engineered ensemble of macroscopic artificial atoms and a superconducting resonator
• Exploring the quantum critical behaviour in a driven Tavis-Cummings circuit
• Simulating weak localization using superconducting quantum circuits
• Fermionic Models with Superconducting Circuits
• Quantum Batteries: A Materials Science Perspective
• Universal gates for transforming multipartite entangled Dicke states
• Critical light-matter entanglement at cavity mediated phase transition
• On-chip generation and collectively coherent control of the superposition of the whole family of Dicke states
• Collective Suppression of Linewidths in Circuit QED
• Mirror and cavity formations by chains of collectively radiating atoms
• Coherent Control with User-Defined Passage
• Dike states in multiple quantum dots
• Tunable quantum entanglement of three qubits in a non-stationary cavity
• Coupling qubits in circuit-QED cavities connected by a bridge qubit
• Quasi-lattices of qubits for generating inequivalent multipartite entanglements
• Parity-assisted generation of nonclassical states of light in circuit quantum electrodynamics
• Resonating valence bonds and spinon pairing in the Dicke model