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Overall Objectives
Application Domains
Bibliography
Overall Objectives
Application Domains
Bibliography


Section: New Results

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

Participants: Zaki Leghtas

In a collaboration with the teams of Steven Girvin and Michel Devoret at Yale University, 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.

This work was published in [26].