Heralded Bell State of Dissipative Qubits Using Classical Light in a Waveguide.
Journal Article (Academic article)
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 that 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.
Full Text
- Published version (via Digital Object Identifier)
- Open Access Copy from Duke
- Publisher Link
- Link to Item
Duke Authors
Cited Authors
- Zhang, XHH; Baranger, HU
Published Date
- April 9, 2019
Published In
Volume / Issue
- 122 /
Chapter
- 140502
Start / End Page
- 140502 - 140502
Pages
- 7
PubMed ID
- 31050491
Electronic International Standard Serial Number (EISSN)
- 1079-7114
International Standard Serial Number (ISSN)
- 0031-9007
Digital Object Identifier (DOI)
- 10.1103/PhysRevLett.122.140502