Self-ordering dynamics of ultracold atoms in multicolored cavity fields

Krämer, Sebastian; Ritsch, Helmut

doi:10.1103/physreva.90.033833

Cited by 22 publications

(26 citation statements)

References 37 publications

(46 reference statements)

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“…Using the dynamical properties of the light [6] the structural Dicke phase transition was achieved forming a state with supersolid features [3]. However, the study of the full quantum regime of the system has been limited to few atoms [9][10][11][12][13]. As the light matter coupling is strongly enhanced in a high finesse optical cavity in a preferred wavelength, the atoms re-emit light comparable with the lasers used in the trapping process.…”

Section: Introductionmentioning

confidence: 99%

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Quantum properties of light scattered from structured many-body phases of ultracold atoms in quantum optical lattices

Caballero-Benítez

Mekhov

2015

New J. Phys.

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Quantum trapping potentials for ultracold gases change the landscape of classical properties of scattered light and matter. The atoms in a quantum many-body correlated phase of matter change the properties of light and vice versa. The properties of both light and matter can be tuned by design and depend on the interplay between long-range (nonlocal) interactions mediated by an optical cavity and short-range processes of the atoms. Moreover, the quantum properties of light get significantly altered by this interplay, leading the light to have nonclassical features. Further, these nonclassical features can be designed and optimised. OPEN ACCESS RECEIVED), we find that the matter induces structure to the squeezing parameter. As it has been shown [24] besides from SF, MI the system supports gapped superfluid states, dimer phases, supersolid (SS) and density waves (DW). 6.2. Diagonal coupling, illuminating at lattice sites. Without bond ordering (J 0 B, = j , J J D, D

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Section: Introductionmentioning

confidence: 99%

“…Recently, density ordering has been achieved with classical atoms [31]. Further, multimode cavities extend the range of quantum phases even further [12,[32][33][34]. Therefore, by carefully tuning system parameters and the spatial structure of light, one can design with plenty of freedom the quantum manybody phases that emerge.…”

Section: Introductionmentioning

confidence: 99%

Quantum properties of light scattered from structured many-body phases of ultracold atoms in quantum optical lattices

Caballero-Benítez

Mekhov

2015

New J. Phys.

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“…More precisely, the quantum state of the system comprises a superposition of electromagnetic fields with equal amplitudes and various phases correlated with corresponding atomic density patterns. Due to quantum jumps induced by cavity photon losses [44][45][46], this highly entangled atom-field state collapses subsequently into a state with a certain random relative field phase and the corresponding atomic density pattern, spontaneously breaking the continuous U (1) symmetry of the system and resulting in a supersolid state [47]. The corresponding gapless Goldstone mode is the frictionless center-of-mass motion of the BEC, which drags the cavity optical lattice with itself and hence changes the relative phase of the two electromagnetic fields of the cavity modes [for brevity, hereinafter referred to as just cavity (field) modes].…”

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confidence: 99%

Supersolid-Based Gravimeter in a Ring Cavity

2019

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We propose a novel type of composite light-matter interferometer based on a supersolid-like phase of a driven Bose-Einstein condensate coupled to a pair of degenerate counterpropagating electromagnetic modes of an optical ring cavity. The supersolid-like condensate under the influence of the gravity drags the cavity optical potential with itself, thereby changing the relative phase of the two cavity electromagnetic fields. Monitoring the phase evolution of the cavity output fields thus allows for a nondestructive measurement of the gravitational acceleration. We show that the sensitivity of the proposed gravimeter exhibits Heisenberg-like scaling with respect to the atom number. As the relative phase of the cavity fields is insensitive to photon losses, the gravimeter is robust against these deleterious effects. For state-of-the-art experimental parameters, the relative sensitivity ∆g/g of such a gravimeter could be of the order of 10 −10 -10 −8 for a condensate of a half a million atoms and interrogation time of the order of a few seconds.Introduction.-Precision measurement plays a vital role in fundamental sciences as well as technological applications. Notably, at the beginning of the twentieth century discrepancies between precise measurements and theory led to the birth of quantum mechanics [1]. Interestingly, quantum mechanics itself in turn opened an entirely new avenue in precision measurement. One of its most flourishing branches is quantum metrology, which exploits the quantum-mechanical framework to perform even more precise measurements than it is allowed by classical approaches [2,3]. Remarkable examples include the development of precise "gravimeters" based on quantum mechanical effects.A gravimeter is an apparatus that measures the local gravitational acceleration. It allows to measure, e.g., magma build-up before volcanic eruptions, hidden hydrocarbon reserves, and Earth's tides [4]. In addition, it also allows to test more fundamental aspects of physics such as local Lorentz invariance [5], the isotropy of post-Newtonian gravity [6], and quantum gravity [7]. The current generation of gravimeters include: microelectromechanical gravimeters [4], free-fall gravimeters [8][9][10][11][12], spring-based gravimeters [13,14], superconducting gravimeters [15], optomechanical gravimeters [16,17], and atom interferometers [18][19][20][21][22][23].In the above list, the atom interferometry deserves a special position because of the possibility of harnessing quantum features of many-body systems [24]. In principle, by using entangled resources, it is possible to increase the precision of measurement over the shot-noise limit [25]. However, noise and decoherence limit the creation and use of quantum correlations [26,27], especially for large samples. Hence, sub-shot-noise interferometry is currently restricted to proof-of-principle experiments with atoms [28][29][30][31][32][33][34] as well as photons [35][36][37][38][39].In this Letter, we propose a novel type of gravimeter based on a supersolid-like state of...

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“…The nonattacking conditions are enforced by a combination of restricted hopping [32] and interactions between the atoms stemming from collective scattering of pump laser light into a multi-mode cavity [33][34][35][36][37][38][39][40] (see Fig. 1).…”

Section: Introductionmentioning

confidence: 99%

A Quantum N-Queens Solver

Torggler

Aumann

Ritsch

et al. 2019

Quantum

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The N -queens problem is to find the position of N queens on an N by N chess board such that no queens attack each other. The excluded diagonals N -queens problem is a variation where queens cannot be placed on some predefined fields along diagonals. This variation is proven NP-complete and the parameter regime to generate hard instances that are intractable with current classical algorithms is known. We propose a special purpose quantum simulator that implements the excluded diagonals N -queens completion problem using atoms in an optical lattice and cavity-mediated long-range interactions. Our implementation has no overhead from the embedding allowing to directly probe for a possible quantum advantage in near term devices for optimization problems.

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Self-ordering dynamics of ultracold atoms in multicolored cavity fields

Cited by 22 publications

References 37 publications

Quantum properties of light scattered from structured many-body phases of ultracold atoms in quantum optical lattices

Quantum properties of light scattered from structured many-body phases of ultracold atoms in quantum optical lattices

Supersolid-Based Gravimeter in a Ring Cavity

A Quantum N-Queens Solver

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