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Theory of remote entanglement via quantum-limited phase-preserving amplification

Matti Silveri 1 Evan Zalys-Geller 1 Michael Hatridge 1 Zaki Leghtas 1, 2, 3 Michel H. Devoret 1 Steven M. Girvin 1
2 QUANTIC - QUANTum Information Circuits
ENS Paris - École normale supérieure - Paris, UPMC - Université Pierre et Marie Curie - Paris 6, MINES ParisTech - École nationale supérieure des mines de Paris, Inria de Paris
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.
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Submitted on : Saturday, November 26, 2016 - 6:36:47 PM
Last modification on : Thursday, February 4, 2021 - 10:20:14 AM

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Matti Silveri, Evan Zalys-Geller, Michael Hatridge, Zaki Leghtas, Michel H. Devoret, et al.. Theory of remote entanglement via quantum-limited phase-preserving amplification. Physical Review A, American Physical Society, 2016, 93, pp.062310. ⟨10.1103/PhysRevA.93.062310⟩. ⟨hal-01403603⟩