Surpassing the standard quantum limit in an atom interferometer with four-mode entanglement produced from four-wave mixing

Haine, Simon A.; Ferris, Andrew J.

doi:10.1103/physreva.84.043624

Cited by 18 publications

(22 citation statements)

References 30 publications

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“…These are based on phenomena as diverse as molecular dissociation [23], spin-exchange collisions [24][25][26], atomic four-wave mixing [27][28][29][30], and atomic Kerr squeezing [31][32][33][34][35][36][37]. However, all these schemes require large interatomic interactions, small atom number, and give little control over the motional atomic state.…”

Section: Introductionmentioning

confidence: 99%

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: Introductionmentioning

confidence: 99%

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

et al. 2014

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“…b † out (t )b out (t ) dt , calculated by numerically solving Eqs. (28). For these parameters, the atomic field grows significantly faster than the cavity field, as photons leak out of the cavity.…”

Section: B Realistic 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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“…Our results open up a host of scenarios for atomic wave mixing experiments and boost BECs as a platform for the study of non-Hermitian physics [34,35] with a diverse pool of loss processes to generate non-Hermiticity. Additionally, they may enhance the utility of BECs for atom interferometry [36], atom lasers [37,38], or entanglement generation [39][40][41][42]. Finally, we provide a specific mechanism of how the required loss profiles can be experimentally implemented.…”

Section: Introductionmentioning

confidence: 99%

Non-Hermitian matter-wave mixing in Bose-Einstein condensates: Dissipation-induced amplification

Wüster

El‐Ganainy

2017

Phys. Rev. A

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We investigate the nonlinear scattering dynamics in interacting atomic Bose-Einstein condensates under non-Hermitian dissipative conditions. We show that, by carefully engineering a momentum-dependent atomic loss profile, one can achieve matter-wave amplification through four-wave mixing in a quasi-one-dimensional nearly-free-space setup-a process that is forbidden in the counterpart Hermitian systems due to energy mismatch. Additionally, we show that similar effects lead to rich nonlinear dynamics in higher dimensions. Finally, we propose a physical realization for selectively tailoring the momentum-dependent atomic dissipation. Our strategy is based on a two-step process: (i) exciting atoms to narrow Rydberg or metastable excited states, and (ii) introducing loss through recoil; all while leaving the bulk condensate intact due to protection by quantum interference.

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Surpassing the standard quantum limit in an atom interferometer with four-mode entanglement produced from four-wave mixing

Cited by 18 publications

References 30 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

Non-Hermitian matter-wave mixing in Bose-Einstein condensates: Dissipation-induced amplification

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