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

Journal Article · · Physical Review Letters

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.

Research Organization:
Duke Univ., Durham, NC (United States)
Sponsoring Organization:
USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division; USDOE Office of Science (SC)
Grant/Contract Number:
SC0005237
OSTI ID:
1783156
Alternate ID(s):
OSTI ID: 1505885; OSTI ID: 1610816
Journal Information:
Physical Review Letters, Vol. 122, Issue 14; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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Cited By (8)

Quantum jump statistics with a shifted jump operator in a chiral waveguide text January 2019
Heralded dissipative preparation of nonclassical states in a Kerr oscillator text January 2019
Utilizing competitions between optical parametric amplifications and dissipations to manipulate photon transport journal August 2019
Quantum jump statistics with a shifted jump operator in a chiral waveguide journal October 2019
Statistically driven model for efficient analysis of few-photon transport in waveguide quantum electrodynamics journal January 2020
Heralded dissipative preparation of nonclassical states in a Kerr oscillator journal January 2020
Bound states in the continuum for an array of quantum emitters journal August 2019
Classification of three-photon states in waveguide quantum electrodynamics journal February 2021