Bogoliubov-Cherenkov radiation in an atom laser

Henson, B. M.; Yue, Xuguang; Hodgman, Sean; Shin, D. K.; Smirnov, L. A.; Ostrovskaya, Elena A.; Guan, Xi-Wen; Truscott, A. G.

doi:10.1103/physreva.97.063601

Cited by 19 publications

(17 citation statements)

References 47 publications

(71 reference statements)

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“…Thus, while our experiments operate in a regime where mean-field effects play no role, one can envision designing a similar procedure to explore supersonic, or even hypersonic, shockwaves 56 . It should be noted that our observations of caustics are distinct from the observation of Bogoliubov–Cherenkov radiation 57 .…”

Section: Resultscontrasting

confidence: 56%

Gravitational caustics in an atom laser

et al. 2021

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Typically discussed in the context of optics, caustics are envelopes of classical trajectories (rays) where the density of states diverges, resulting in pronounced observable features such as bright points, curves, and extended networks of patterns. Here, we generate caustics in the matter waves of an atom laser, providing a striking experimental example of catastrophe theory applied to atom optics in an accelerated (gravitational) reference frame. We showcase caustics formed by individual attractive and repulsive potentials, and present an example of a network generated by multiple potentials. Exploiting internal atomic states, we demonstrate fluid-flow tracing as another tool of this flexible experimental platform. The effective gravity experienced by the atoms can be tuned with magnetic gradients, forming caustics analogous to those produced by gravitational lensing. From a more applied point of view, atom optics affords perspectives for metrology, atom interferometry, and nanofabrication. Caustics in this context may lead to quantum innovations as they are an inherently robust way of manipulating matter waves.

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Section: Resultscontrasting

confidence: 56%

Gravitational caustics in an atom laser

et al. 2021

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“…The former limits the interrogation duration (T ) which would otherwise scale the frequency uncertainty (σ ω ) as 1/T and is increased by the thermal fraction, trap frequency and anharmonic components of the trap. The standard error of the PAL mean velocity is determined by the velocity distribution of an atom laser pulse in the far field which arises from the complex outcoupling dynamics we have investigated previously [36]. We have derived a simple expression for this uncertainty given in section VI E which has been validated with simulations of outcoupling dynamics, both predicting a single-shot uncertainty of ≈ 5 mHz.…”

Section: B Statistical and Systematic Errormentioning

confidence: 94%

“…the BEC as they fall [36]. This generates a disk shaped distribution in the tight axes (here y, z) along with a vertical cut upwards and a number of interference fringes.…”

Section: Outcoupling Dynamicsmentioning

confidence: 99%

“…This treatment neglects that some fraction of the up-going atoms from an atom laser pulse scatter off the BEC as they fall generating Bogoliubov-Cherenkov (BCR) radiation tails [36], this scattering is bounded by a reflection in the vertical direction (in principle, there is a secondary scattering process, however its probability is negligible). To be sure that there is no overlap of these scattered trajectories then an outcoupling period of t s = 4v max /g is necessary.…”

Section: Maximum Outcoupling Frequencymentioning

confidence: 99%

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Trap Frequency Measurement with a Pulsed Atom Laser

Henson,

Thomas,

Mehdi

et al. 2022

Preprint

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We describe a novel method of single-shot trap frequency measurement for a confined Bose-Einstein Condensate, which uses an atom laser to repeatedly sample the mean velocity of trap oscillations as a function of time. In our experiment this approach is able to determine the trap frequency to an accuracy of 39 ppm (16 mHz) in a single experimental realization, improving on the literature by a factor of three. Further, we show that by employing a reconstructive aliasing approach our method can be applied to trap frequencies much higher than the sampling frequency.

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“…Subsequently, the atoms are detected by an diameter microchannel plate and delay line detector located below the trap. The free-fall duration gives the time at detection , while the detector has a spatio-temporal resolution of ~ 40 and a quantum efficiency of .…”

Section: Methodsmentioning

confidence: 99%

Bell correlations between spatially separated pairs of atoms

et al. 2019

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Bell correlations are a foundational demonstration of how quantum entanglement contradicts the classical notion of local realism. Rigorous validation of quantum nonlocality have only been achieved between solid-state electron spins, internal states of trapped atoms, and photon polarisations, all weakly coupling to gravity. Bell tests with freely propagating massive particles, which could provide insights into the link between gravity and quantum mechanics, have proven to be much more challenging to realise. Here we use a collision between two Bose-Einstein condensates to generate spin entangled pairs of ultracold helium atoms, and measure their spin correlations along uniformly rotated bases. We show that correlations in the pairs agree with the theoretical prediction of a Bell triplet state, and observe a quantum mechanical witness of Bell correlations with $$6\sigma$$ 6 σ significance. Extensions to this scheme could find promising applications in quantum metrology, as well as for investigating the interplay between quantum mechanics and gravity.

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Bogoliubov-Cherenkov radiation in an atom laser

Cited by 19 publications

References 47 publications

Gravitational caustics in an atom laser

Gravitational caustics in an atom laser

Trap Frequency Measurement with a Pulsed Atom Laser

Bell correlations between spatially separated pairs of atoms

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