Beating the 3 dB Limit for Intracavity Squeezing and Its Application to Nondemolition Qubit Readout

• URL: http://arxiv.org/abs/2203.06892v2
• Date: Mon, 19 Sep 2022 05:33:58 GMT
• Title: Beating the 3 dB Limit for Intracavity Squeezing and Its Application to Nondemolition Qubit Readout
• Abstract summary: We show that by it simply applying a two-tone driving to the signal mode, the pump mode can be driven by the photon loss of the signal mode into a squeezed steady state. We demonstrate that this intracavity squeezing can increase the signal-to-noise ratio of longitudinal qubit readout. Our results extend the range of applications of DPAs and open up new opportunities for modern quantum technologies.
• Score: 0.9852567834643291
• License: http://creativecommons.org/publicdomain/zero/1.0/
• Abstract: While the squeezing of a propagating field can, in principle, be made arbitrarily strong, the cavity-field squeezing is subject to the well-known 3 dB limit, and thus has limited applications. Here, we propose the use of a fully quantum degenerate parametric amplifier (DPA) to beat this squeezing limit. Specifically, we show that by {\it simply} applying a two-tone driving to the signal mode, the pump mode can, {\it counterintuitively}, be driven by the photon loss of the signal mode into a squeezed steady state with, in principle, an {\it arbitrarily high} degree of squeezing. Furthermore, we demonstrate that this intracavity squeezing can increase the signal-to-noise ratio of longitudinal qubit readout {\it exponentially} with the degree of squeezing. Correspondingly, an improvement of the measurement error by {\it many orders of magnitude} can be achieved even for modest parameters. In stark contrast, using intracavity squeezing of the semiclassical DPA {\it cannot} practically increase the signal-to-noise ratio and thus improve the measurement error. Our results extend the range of applications of DPAs and open up new opportunities for modern quantum technologies.

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