Information-Recycling Beam Splitters for Quantum Enhanced Atom Interferometry

Haine, Simon A.

doi:10.1103/physrevlett.110.053002

Cited by 37 publications

(42 citation statements)

References 27 publications

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“…For instance, at Q = 0.5, corresponding to θ QST = π/2 in the undepleted reservoir regime, the enhancement to the sensitivity beyond the SQL has dropped by a factor of 20 to ∼ √ 2. Fortunately, this degradation to the sensitivity due to incomplete QST can be ameliorated with the technique of information recycling [52]. Specifically, after the atom-light beamsplitter, a quadrature of the transmitted fieldb(t 1 ) can be measured via homodyne detection by mixing the fieldb(t 1 ) with a bright local oscillatorb LO (t 1 ), which is assumed to be a large amplitude coherent state (see Fig.…”

Section: Fig 8 (Color Online)mentioning

confidence: 99%

“…Our analysis considers the effects of incomplete quantum state transfer (QST) between the optical and atomic modes, and the effect of depleting the initial condensate mode. We also incorporate the technique of information recycling [52] into our schemes, and demonstrate that this can be used to combat the negative effects of incomplete QST. Given the maturity of squeezed light generation technology, and the high efficiency of photon detection, it would be relatively straightforward to incorporate our schemes into existing state-of-the-art atom interferometers.…”

Section: Introductionmentioning

confidence: 99%

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Squeezed-light-enhanced atom interferometry below the standard quantum limit

et al. 2014

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We investigate the prospect of enhancing the phase sensitivity of atom interferometers in the Mach-Zehnder configuration with squeezed light. Ultimately, this enhancement is achieved by transferring the quantum state of squeezed light to one or more of the atomic input beams, thereby allowing operation below the standard quantum limit. We analyze in detail three specific schemes that utilize (1) single-mode squeezed optical vacuum (i.e., low-frequency squeezing), (2) two-mode squeezed optical vacuum (i.e., high-frequency squeezing) transferred to both atomic inputs, and (3) two-mode squeezed optical vacuum transferred to a single atomic input. Crucially, our analysis considers incomplete quantum state transfer (QST) between the optical and atomic modes, and the effects of depleting the initially prepared atomic source. Unsurprisingly, incomplete QST degrades the sensitivity in all three schemes. We show that by measuring the transmitted photons and using information recycling [Phys. Rev. Lett. 110, 053002 (2013)], the degrading effects of incomplete QST on the sensitivity can be substantially reduced. In particular, information recycling allows scheme (2) to operate at the Heisenberg limit irrespective of the QST efficiency, even when depletion is significant. Although we concentrate on Bosecondensed atomic systems, our scheme is equally applicable to ultracold thermal vapors.

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Section: Fig 8 (Color Online)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Squeezed-light-enhanced atom interferometry below the standard quantum limit

et al. 2014

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“…However, as in [37,40,[47][48][49], we can gain an enhancement by using information recycling: if the atomic degrees of freedom are correlated with the optical field, it may be possible to gain an enhancement by incorporating measurements of the optical field into our signal. Specifically, we choosê…”

Section: B Measurement Stagementioning

confidence: 99%

“…(5). In [37], as we did not include an optical cavity, a seed in modeâ 2 was required to stimulate transitions into this mode. A minimum value of the seed was required in order for the stimulated processes to dominate the spontaneous emission.…”

Section: Cavity Dynamics a Perfect Cavitymentioning

confidence: 99%

Generation of atom-light entanglement in an optical cavity for quantum enhanced atom interferometry

Haine

Lau

2016

Phys. Rev. A

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We theoretically investigate the generation of atom-light entanglement via Raman superradiance in an optical cavity, and show how this can be used to enhance the sensitivity of atom interferometry. We model a realistic optical cavity, and show that by careful temporal shaping of the optical local oscillator used to measure the light emitted from the cavity, information in the optical mode can be combined with the signal from the atom interferometer to reduce the quantum noise, and thus increase the sensitivity. It was found in Phys. Rev. Lett. 110, 053002 (2013) that an atomic "seed" was required in order to reduce spontaneous emission and allow for single mode behavior of the device. In this paper we find that the optical cavity reduces the need for an atomic seed, which allows for stronger atom-light correlations and a greater level of quantum enhancement.

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“…II, we describe our spin-squeezing scheme and present a multimode simulation of the quantum dynamics using the truncated Wigner approach, which has been shown to be highly successful in simulating such systems [21][22][23][24][25][26][27][28][29][30]. In Sec.…”

Section: Introductionmentioning

confidence: 99%

Self-induced spatial dynamics to enhance spin squeezing via one-axis twisting in a two-component Bose-Einstein condensate

et al. 2014

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We theoretically investigate a scheme to enhance relative number squeezing and spin squeezing in a twocomponent Bose-Einstein condensate (BEC) by utilizing the inherent mean-field dynamics of the condensate. Due to the asymmetry in the scattering lengths, the two components exhibit large density oscillations where they spatially separate and recombine. The effective nonlinearity responsible for the squeezing is increased by up to 3 orders of magnitude when the two components spatially separate. We perform a multimode simulation of the system using the truncated Wigner method and show that this method can be used to create significant squeezing in systems where the effective nonlinearity would ordinarily be too small to produce any significant squeezing in sensible time frames, and we show that strong spatial dynamics resulting from large particle numbers aren't necessarily detrimental to generating squeezing. We develop a simplified semianalytic model that gives good agreement with our multimode simulation and will be useful for predicting squeezing in a range of different systems.

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Information-Recycling Beam Splitters for Quantum Enhanced Atom Interferometry

Cited by 37 publications

References 27 publications

Squeezed-light-enhanced atom interferometry below the standard quantum limit

Squeezed-light-enhanced atom interferometry below the standard quantum limit

Generation of atom-light entanglement in an optical cavity for quantum enhanced atom interferometry

Self-induced spatial dynamics to enhance spin squeezing via one-axis twisting in a two-component Bose-Einstein condensate

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