High-Resolution Magnetometry with a Spinor Bose-Einstein Condensate

Vengalattore, Mukund; Higbie, James; Leslie, Sabrina; Guzman, Jennie; Sadler, Lorraine; Stamper-Kurn, Dan

doi:10.1103/physrevlett.98.200801

Cited by 240 publications

(251 citation statements)

References 22 publications

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“…To explore these properties, we employ magnetizationsensitive dispersive imaging. In contrast to previous work [28,29], in which the magnetization was reconstructed from a series of images taken during Larmor precession, here we obtain a direct snapshot of the vector magnetization with just three images by applying spin-echo rf pulses between probes. Specifically, after a variable equilibration time, we apply the first imaging pulse, sending linearly polarized probe light propagating along theŷ axis and measuring its optical rotation to resolve one transverse component of the column-integrated magnetizationM(ρ) with the position vector ρ in the imaged x-ẑ plane.…”

Section: -2mentioning

confidence: 99%

Long-time-scale dynamics of spin textures in a degenerateF=187Rb spinor Bose gas

et al. 2011

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We investigate the long-term dynamics of spin textures prepared by cooling unmagnetized spinor gases of F = 1 87 Rb to quantum degeneracy, observing domain coarsening and a strong dependence of the equilibration dynamics on the quadratic Zeeman shift q. For small values of |q|, the textures arrive at a configuration independent of the initial spin-state composition, characterized by large length-scale spin domains and the establishment of easy-axis (negative q) or easy-plane (positive q) magnetic anisotropy. For larger |q|, equilibration is delayed as the spin-state composition of the degenerate spinor gas remains close to its initial value. These observations support the mean-field equilibrium phase diagram predicted for a ferromagnetic spinor Bose-Einstein condensate and also illustrate that equilibration is achieved under a narrow range of experimental settings, making the F = 1 87 Rb gas more suitable for studies of nonequilibrium quantum dynamics.

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Section: -2mentioning

confidence: 99%

Long-time-scale dynamics of spin textures in a degenerateF=187Rb spinor Bose gas

et al. 2011

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“…Atom interferometry is a leading precision measurement technology, having demonstrated state-of-the-art measurements of accelerations and rotations [1][2][3][4][5][6], gravity gradients [7,8], magnetic fields [9], the fine structure constant (α) [10,11], and Newton's gravitational constant (G) [12][13][14][15]. Further increases to the sensitivity of atom interferometers would allow for some exciting science, such as improved tests of the weak equivalence principle [16][17][18], searches for quantum gravitational effects [19], and the measurement of gravitational waves [20,21].…”

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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“…The existence of roton-like excitations generally implies that the system has a tendency towards developing crystalline order, and the softening of the roton mode is often a route towards realizing correlated states of matter such as supersolids and Wigner crystals in Bose and Fermi systems [30][31][32][33][34][35][36]. Observing this mode therefore constitutes an essential first step towards the study of many body physics in dipolar systems.…”

Section: Introductionmentioning

confidence: 99%

Dynamics of correlations in a quasi-two-dimensional dipolar Bose gas following a quantum quench

Natu

Campanello²,

Sarma³

2014

Phys. Rev. A

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We study the evolution of correlations in a quasi-2D dipolar gas driven out-of-equilibrium by a sudden ramp of the interactions. On short timescales, roton-like excitations coherently oscillate in and out of the condensate, giving rise to pronounced features in the time-evolution of the momentum distribution, excited fraction and the density-density correlation function. The evolution of these correlation functions following a quench can thus be used to probe the spectrum of the dipolar gas. We also find that density fluctuations induced by the presence of rotons following the quench, dramatically slows down the rate of spreading of correlations in the system: near the roton instability, correlations take infinitely long to build up and show deviations from light-cone like behavior.

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High-Resolution Magnetometry with a Spinor Bose-Einstein Condensate

Cited by 240 publications

References 22 publications

Long-time-scale dynamics of spin textures in a degenerateF=187Rb spinor Bose gas

Long-time-scale dynamics of spin textures in a degenerateF=187Rb spinor Bose gas

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

Dynamics of correlations in a quasi-two-dimensional dipolar Bose gas following a quantum quench

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