scholarly journals Optomechanical resonator-enhanced atom interferometry

2020 ◽  
Vol 3 (1) ◽  
Author(s):  
Logan L. Richardson ◽  
Ashwin Rajagopalan ◽  
Henning Albers ◽  
Christian Meiners ◽  
Dipankar Nath ◽  
...  
Keyword(s):  
Cold Atoms ◽  
Dynamic Range ◽  
Atom Interferometry ◽  
Matter Wave ◽  
Noisy Environment ◽  
Large Dynamic Range ◽  
Matter Waves ◽  
Large Potential

AbstractMatter-wave interferometry and spectroscopy of optomechanical resonators offer complementary advantages. Interferometry with cold atoms is employed for accurate and long-term stable measurements, yet it is challenged by its dynamic range and cyclic acquisition. Spectroscopy of optomechanical resonators features continuous signals with large dynamic range, however it is generally subject to drifts. In this work, we combine the advantages of both devices. Measuring the motion of a mirror and matter waves interferometrically with respect to a joint reference allows us to operate an atomic gravimeter in a seismically noisy environment otherwise inhibiting readout of its phase. Our method is applicable to a variety of quantum sensors and shows large potential for improvements of both elements by quantum engineering.

A Path Integral Monte Carlo Study of Anderson Localization in Cold Gases in the Presence of Disorder

2016 ◽  
Vol 13 (06) ◽  
pp. 1650032
Author(s):  
S. Datta
Keyword(s):  
Monte Carlo ◽  
Path Integral ◽  
Quantum Monte Carlo ◽  
Anderson Localization ◽  
Cold Atoms ◽  
Monte Carlo Technique ◽  
Scaling Theory ◽  
Alternative Measure ◽  
Path Integral Monte Carlo ◽  
Matter Waves

We revisit the problem of Anderson localization in a trapped Bose–Einstein condensate in 1D and 3D in a disordered potential, applying Quantum Monte Carlo technique because the disorder cannot be treated accurately in a perturbative way as even a small amount of disorder can produce dramatic changes in the physical properties of the system under investigation. Till date no unambiguous evidence of localization has been observed for matter waves in 3D. Matter waves made up of cold atoms are good candidates for such investigations. Simulations are performed for Rb gas in continuous space using canonical ensemble in the case of random and quasi-periodic potentials. To realize random and quasiperiodic potentials numerically we use speckle and bichromatic potentials, respectively. Owing to the high degree of control over the system parameters we specifically study the interplay of disorder and interaction in the system. A dilute Bose gas placed in a random environment falls into a fragmented localized state and the ergodicity (the repetitiveness of the wave function) is lost. An arbitrary Interaction can slowly overcome the effect of disorder and restore the ergodicity again. We observe that as the interaction strength increases, the wave functions become more and more delocalized. Since vanishing of Lyapunov exponent is only a necessary but not a sufficient condition for delocalization for probing the localization we calculate the mean square displacements as an alternative measure of localization. The path integral Monte Carlo technique in this paper numerically establishes the existing predictions of the scaling theory so far and paves a clear path for the further investigation of scaling theory to calculate more complicated properties like ‘critical exponents’ etc. in disordered quantum gases.

Resonant transmission and beaming of cold atoms assisted by surface matter waves

2008 ◽  
Vol 78 (2) ◽  
Author(s):  
A. I. Fernández-Domínguez ◽  
D. Martín-Cano ◽  
E. Moreno ◽  
L. Martín-Moreno ◽  
F. J. García-Vidal
Keyword(s):  
Cold Atoms ◽  
Matter Waves ◽  
Resonant Transmission

Loading a dressed Zeeman trap with cold atoms

2004 ◽  
Vol 116 ◽  
pp. 247-252 ◽  
Author(s):  
Y. Colombe ◽  
B. Mercier ◽  
H. Perrin ◽  
V. Lorent
Keyword(s):  
Cold Atoms

Strategic Applications of Ultra-Cold Atoms

2008 ◽  
Author(s):  
Mara Prentiss ◽  
Vladan Vuletic Mark /Kasevich ◽  
Wolfgang Ketterle ◽  
Pierre Meystre
Keyword(s):  
Cold Atoms

Probing Bloch oscillations using a slow-light sensor

2020 ◽  
Vol 9 (5) ◽  
pp. 243-246
Author(s):  
Pei-Chen Kuan ◽  
Chang Huang ◽  
Shau-Yu Lan
Keyword(s):  
Phase Shift ◽  
Optical Lattice ◽  
Cold Atoms ◽  
Slow Light ◽  
Internal State ◽  
Electromagnetically Induced Transparency ◽  
Bloch Oscillations ◽  
Bloch Oscillation ◽  
Induced Transparency ◽  
Transparency Condition

AbstractWe implement slow-light under electromagnetically induced transparency condition to measure the motion of cold atoms in an optical lattice undergoing Bloch oscillation. The motion of atoms is mapped out through the phase shift of light without perturbing the external and internal state of the atoms. Our results can be used to construct a continuous motional sensor of cold atoms.

scholarly journals Moiré pattern of interference dislocations in condensate of indirect excitons

2021 ◽  
Vol 12 (1) ◽  
Author(s):  
J. R. Leonard ◽  
Lunhui Hu ◽  
A. A. High ◽  
A. T. Hammack ◽  
Congjun Wu ◽  
...  
Keyword(s):  
Long Range ◽  
Direct Measurement ◽  
Quantum Systems ◽  
Matter Waves ◽  
Moire Pattern ◽  
Indirect Excitons ◽  
Moiré Pattern ◽  
Moiré Effect ◽  
Phase Singularities ◽  
Bose Einstein

AbstractInterference patterns provide direct measurement of coherent propagation of matter waves in quantum systems. Superfluidity in Bose–Einstein condensates of excitons can enable long-range ballistic exciton propagation and can lead to emerging long-scale interference patterns. Indirect excitons (IXs) are formed by electrons and holes in separated layers. The theory predicts that the reduced IX recombination enables IX superfluid propagation over macroscopic distances. Here, we present dislocation-like phase singularities in interference patterns produced by condensate of IXs. We analyze how exciton vortices and skyrmions should appear in the interference experiments and show that the observed interference dislocations are not associated with these phase defects. We show that the observed interference dislocations originate from the moiré effect in combined interference patterns of propagating condensate matter waves. The interference dislocations are formed by the IX matter waves ballistically propagating over macroscopic distances. The long-range ballistic IX propagation is the evidence for IX condensate superfluidity.

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