Delay of Squeezing and Entanglement using Electromagnetically Induced Transparency in a Vapour Cell

Abstract

We demonstrate experimentally the delay of squeezed light and entanglement using Electromagnetically Induced Transparency (EIT) in a rubidium vapour cell. We perform quadrature amplitude measurements of the probe field and find no appreciable excess noise from the EIT process. From an input squeezing of 3.1 dB at low sideband frequencies, we observed the survival of 2 dB of squeezing at the EIT output. By splitting the squeezed light on a beam-splitter, we generated biased entanglement between two beams. We transmit one of the entangled beams through the EIT cell and correlate the quantum statistics of this beam with its entangled counterpart. We experimentally observed a 2 $\mu$s delay of the biased entanglement and obtained a preserved degree of wavefunction inseparability of 0.71, below the unity value for separable states.

8 pages, 5 figures

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• A practical guide to electromagnetically induced transparency in atomic vapor
• Optical Quantum Computation
• Propagation of Squeezed Vacuum under Electromagnetically Induced Transparency
• Generation of polarization squeezed light with an optical parametric amplifier at 795 nm
• Observation and measurement of an extra phase shift created by optically detuned light storage in metastable helium
• Comparison of Qubit and Qutrit like Entangled Squeezed and Coherent States of Light
• Direct Imaging of Slow, Stored, and Stationary EIT Polaritons