Rubidium resonant squeezed light from a diode-pumped optical-parametric oscillator

Predojević, Ana; Zhai, Z.; Caballero, Jesús; Mitchell, Morgan W.

doi:10.1103/physreva.78.063820

Cited by 50 publications

(81 citation statements)

References 53 publications

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“…These characteristics make diode lasers an ideal candidate for developing an integratable quantum light source. Squeezed states with diode lasers as the pump sources have been demonstrated in OPAs and OPOs [23,24]. In this Letter, we report the construction of a compact diode-laser-pumped quantum light source based on FWM in hot rubidium vapor capable of producing intensitydifference squeezing down to 8 kHz with a maximum of −7 dB.…”

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confidence: 96%

Compact diode-laser-pumped quantum light source based on four-wave mixing in hot rubidium vapor

et al. 2012

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Using a nondegenerate four-wave mixing process in hot rubidium vapor, we demonstrate a compact diode-laser-pumped system for the generation of intensity-difference squeezing down to 8 kHz with a maximum squeezing of -7 dB. To the best of our knowledge, this is the first demonstration of kilohertz-level intensity-difference squeezing using a semiconductor laser as the pump source. This scheme is of interest for experiments involving atomic ensembles, quantum communications, and precision measurements. The diode-laser-pumped system would extend the range of possible applications for squeezing due to its low cost, ease of operation, and ease of integration.

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Compact diode-laser-pumped quantum light source based on four-wave mixing in hot rubidium vapor

et al. 2012

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“…1 (a). A polarization-squeezed probe beam is generated as in [36] by combining local oscillator (LO) laser light with orthogonally polarized squeezed vacuum using a parametric oscillator described in [37], cavity locking system as in [38], and a quantum noise lock (to ensure the measured Stokes component is the squeezed component) described in [33,39]. The probe frequency is stabilized to 20 GHz to the blue of the 85 Rb D 1 unshifted line using the system of [40].…”

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Squeezed-light spin noise spectroscopy

et al. 2016

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We report quantum enhancement of Faraday rotation spin noise spectroscopy by polarization squeezing of the probe beam. Using natural abundance Rb in 100 Torr of N2 buffer gas, and squeezed light from a sub-threshold optical parametric oscillator stabilized 20 GHz to the blue of the D1 resonance, we observe that an input squeezing of 3.0 dB improves the signal-to-noise ratio by 1.5 dB to 2.6 dB over the combined (power)⊗(number density) ranges (0.5 mW to 4.0 mW)⊗(1.5 ×10 12 cm −3 to 1.3 ×10 13 cm −3 ), covering the ranges used in optimized spin noise spectroscopy experiments. We also show that squeezing improves the trade-off between statistical sensitivity and broadening effects, a previously unobserved quantum advantage.The presence of intrinsic fluctuations of a spin system in thermal equilibrium was first predicted by Bloch [1] and experimentally demonstrated in the 1980's by Aleksandrov and Zapasskii [2]. In the last decade, "spin noise spectroscopy" (SNS) has emerged as a powerful technique for determining physical properties of an unperturbed spin system from its noise power spectrum [3,4]. SNS has allowed measurement of g-factors, nuclear spin, isotope abundance ratios and relaxation rates of alkali atoms [5,6], g-factors, relaxation times and doping concentration of electrons in semiconductors [7][8][9][10][11] and localized holes in quantum dot ensembles [12,13] including single hole spin detection [14]. Recently, SNS has been used to study complex optical transitions and broadening processes [15,16], coherent phenomena beyond linear response [17] and cross-correlations of heterogeneous spin systems [18,19].Spin noise has been measured with nuclear magnetic resonance [20,21] and magnetic force microscopy [22][23][24], but the most sensitive and widely used detection technique is Faraday rotation (FR) [2,5,6], in which the spin noise is mapped onto the polarization of an off-resonant probe. In FR-SNS, spin noise near the Larmor frequency competes with quantum noise [25] of the detected photons, i.e., the optical shot noise. The main figure of merit is η, the peak power spectral density (PSD) due to spin noise over the PSD due to shot noise, called "signal strength" [26] or the "signal-to-noise ratio" (SNR). Reported SNR for single-pass atomic ensembles ranges from 0 dB to 13 dB [5,27], and up to 21 dB in atomic multi-pass cells [28]. Due to weaker coupling to the probe beam, reported SNR ranges from −50 dB to −20 dB in semiconductor systems (See Table 1 in [26]). Several works have studied how to improve the polarimetric sensitivity [29] or to cancel technical noise sources [7,8,10], but without altering the fundamental tradeoff between sensitivity and broadening processes [29].For small optical power P and atomic density n, SNR is linear in each: η ∝ nP . At higher values, light scattering and atomic collisions broaden the spin noise resonances, and thus introduce systematic errors in measurements, e.g. of relaxation rates, that are derived from the SNS linewidth [5][6][7]. This trade-off between statis...

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“…After the first experimental demonstration of squeezing [14], also the generation of squeezed light by a collection of atoms within a high-finesse cavity was achieved [15]. More recently, soliton squeezing by spectral filtering [16], the generation of continuous variable entanglement and squeezing [17], and resonant squeezed light from a diode-pumped optical-parametric oscillator [18] could be demonstrated. It is interesting to note that squeezing itself also has quantum limits [19].…”

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confidence: 99%