Heralded Bell State of Dissipative Qubits Using Classical Light in a Waveguide

Abstract

Maximally entangled two-qubit states (Bell states) are of central importance in quantum technologies. We show that heralded generation of a maximally entangled state of two intrinsically open qubits can be realized in a one-dimensional (1d) system through strong coherent driving and continuous monitoring. In contrast to the natural idea that dissipation leads to decoherence and so destroys quantum effects, continuous measurement and strong interference in our 1d system generate a pure state with perfect quantum correlation between the two open qubits. Though the steady state is a trivial product state which has zero coherence or concurrence, we show that, with carefully tuned parameters, a Bell state can be generated in the system's quantum jump trajectories, heralded by a reflected photon. Surprisingly, this maximally entangled state survives the strong coherent state input---a classical state that overwhelms the system. This simple method to generate maximally entangled states using classical coherent light and photon detection may, since our qubits are in a 1d continuum, find application as a building block of quantum networks.

arXiv comment6+4 pages; Published version. Typos corrected. More contents added (single detector case, suppression of effective qubit-qubit interaction, brief discussion of detuned parameters)

References in corpus (41)

• Entanglement of Formation of an Arbitrary State of Two Qubits
• The Quantum Internet
• Bell nonlocality
• Quantum state transfer and entanglement distribution among distant nodes in a quantum network
• Interfacing single photons and single quantum dots with photonic nanostructures
• Microwave photonics with superconducting quantum circuits
• Quantum information processing with superconducting circuits: a review
• Creation of entangled states of distant atoms by interference
• Entanglement of two qubits mediated by one-dimensional plasmonic waveguides
• Strongly interacting photons in one-dimensional continuum
• Entangled states and collective nonclassical effects in two-atom systems
• Quantum Optics of Chiral Spin Networks
• Persistent Quantum Beats and Long-Distance Entanglement from Waveguide-Mediated Interactions
• Open-System Dynamics of Entanglement
• Input-output theory for waveguide QED with an ensemble of inhomogeneous atoms
• Quantum simulations and many-body physics with light
• Photonic Quantum Circuits with Time Delays
• Dissipation-driven generation of two-qubit entanglement mediated by plasmonic waveguides
• Exciting a Bound State in the Continuum through Multi-Photon Scattering plus Delayed Quantum Feedback
• Time-delayed quantum feedback control
• Waveguide QED: Power Spectra and Correlations of Two Photons Scattered Off Multiple Distant Qubits and a Mirror
• Multi-qubit entanglement in bi-directional chiral waveguide QED
• Single Photon Transport through an Atomic Chain Coupled to a One-dimensional Nanophotonic Waveguide
• Bound states and entanglement generation in waveguide quantum electrodynamics
• Scattering of two photons from two distant qubits: Exact solution
• Generation, manipulation, and detection of two-qubit entanglement in waveguide QED
• A chiral route to spontaneous entanglement generation
• Non-Markovian effects in waveguide-mediated entanglement
• Delayed Coherent Quantum Feedback from a Scattering Theory and a Matrix Product State Perspective
• Entanglement within the Quantum Trajectory Description of Open Quantum Systems
• Non-Markovian Dynamics of a Qubit Due to Single-Photon Scattering in a Waveguide
• The upside of noise: engineered dissipation as a resource in superconducting circuits
• Transient and steady-state entanglement mediated by three-dimensional plasmonic waveguides
• Entanglement dynamics in open two-qubit systems via diffusive quantum trajectories
• Quantum trajectories and their statistics for remotely entangled quantum bits
• Quasideterministic realization of a universal quantum gate in a single scattering process
• Average Entanglement for Markovian Quantum Trajectories
• Physically Realizable Entanglement by Local Continuous Measurements
• Quantum Interference and Complex Photon Statistics in Waveguide QED
• Exact decoherence-free state of two distant quantum systems in a non-Markovian environment
• Long-lived entanglement of two multilevel atoms in a waveguide

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• Classification of three-photon states in waveguide quantum electrodynamics
• Entanglement of a pair of quantum emitters via continuous fluorescence measurements: a tutorial
• Long-time Bell states of waveguide-mediated qubits via continuous measurement
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• Quantum jump statistics with a shifted jump operator in a chiral waveguide
• Non-Markovian dynamics of generation of bound states in the continuum via single-photon scattering
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• Quantum Engineering of Superdark Excited States in Arrays of Atoms
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