Theory of remote entanglement via quantum-limited phase-preserving amplification
Abstract
We show that a quantum-limited phase-preserving amplifier can act as a which-path information eraser when followed by heterodyne detection. This 'beam splitter with gain' implements a continuous joint measurement on the signal sources. As an application, we propose heralded concurrent remote entanglement generation between two qubits coupled dispersively to separate cavities. Dissimilar qubit-cavity pairs can be made indistinguishable by simple engineering of the cavity driving fields providing further experimental flexibility and the prospect for scalability. Additionally, we find an analytic solution for the stochastic master equation, a quantum filter, yielding a thorough physical understanding of the nonlinear measurement process leading to an entangled state of the qubits. We determine the concurrence of the entangled states and analyze its dependence on losses and measurement inefficiencies.
Keywords
Cite
@article{arxiv.1507.00732,
title = {Theory of remote entanglement via quantum-limited phase-preserving amplification},
author = {Matti Silveri and Evan Zalys-Geller and Michael Hatridge and Zaki Leghtas and Michel H. Devoret and S. M. Girvin},
journal= {arXiv preprint arXiv:1507.00732},
year = {2016}
}
Comments
Main text (11 pages, 5 figures), updated to the published version