Coherent phase control of two-color continuous variable entangled light
Andrea Grimaldi, Valeriy Novikov, T\'ulio Brito Brasil, Eugene Simon Polzik
TL;DR
This paper introduces a technique for coherent control of two-color continuous variable entangled light generated by an optical parametric oscillator, enabling stable quantum measurements for quantum communication and sensing.
Contribution
We develop a control scheme for two-color EPR states that enhances stability and characterization of entanglement in quantum optical systems.
Findings
Achieved 9 dB of two-mode squeezing in the acoustic frequency range.
Demonstrated robust control of homodyne detection for separated quantum fields.
Enabled stabilization and characterization of entangled two-color light.
Abstract
A continuous variable Einstein-Podolsky-Rosen (EPR) state is a resource for secure quantum communication and distributed quantum sensing. Here we present a technique for coherent control of the two-color EPR state generated by a frequency nondegenerate optical parametric oscillator. The scheme allows for robust control of the homodyne detection of each of the two EPR quantum fields separated by 200 nanometers. We apply our control scheme to stabilize and characterize a strong entangled state of two-color light displaying 9 dB of two-mode squeezing in the acoustic frequency range, making it a valuable tool for quantum networking and quantum metrology.
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