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Conference on Lasers and Electro-Optics

Mechanically Mediated Entanglement of Propagating Optical Modes

Junxin Chen, Massimiliano Rossi, David Mason, Albert Schließer

Published Jan 1, 2020• 0 citations
Publisher

Abstract

We demonstrate stationary entanglement between two non-degenerate prop agating optical modes, via interaction with the same soft-clamped mechanical mode. We detect, without any corrections, correlations corresponding to a logarithmic negativity of En = 0.35.
DOI
10.1364/cleo_qels.2020.fth4d.3

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We experimentally demonstrate a source of squeezed light featuring simultaneous ponderomotive squeezing from two mechanical modes of an optomechanical system. We use ultra-coherent vibrational modes (Q factors on the order of 108) of a soft-clamped membrane placed in a Fabry–Pérot optical cavity at cryogenic conditions (T=11K) to create correlations between amplitude and phase quadratures of the light field. As a result of the interaction between the membrane position and the light, we generated ponderomotive squeezing of 4.8dB for the first localized mechanical mode at 1.32MHz and 4.2dB for the second localized mode at 2.43MHz, as observed in direct detection when correcting for the detection inefficiency. Thus, we have demonstrated that by leveraging more than one quantum-limited mechanical mode, optomechanical squeezed light generation can be extended to dual-band operation with an ample band separation of about an octave. Utilizing homodyne detection to detect squeezing in an optimal quadrature would lead to squeezing levels at the output of the cavity of 7.3 dB and 6.8 dB, in the two modes, respectively. Squeezing of light demonstrated here for near-infrared light can be achieved in a broad range of wavelengths due to the relative insensitivity of optomechanical interaction with SiN membranes to the wavelength. The demonstrated dual-band squeezing can be linked to the generation of two photon–phonon entangled mode pairs, suggesting that our system, viewed as an entanglement source, is more resource-efficient than single-mode optomechanics.