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Full distribution functions of quantum noise in an interacting many-body system | S. Hofferberth
; I. Lesanovsky
; T. Schumm
; J. Schmiedmayer
; A. Imambekov
; V. Gritsev
; E. Demler
; | Date: |
8 Oct 2007 | Abstract: | The probabilistic nature of measurements and the resulting intrinsic quantum
noise in observables is one of the fundamental aspects of quantum mechanics
[1]. It is well studied on the single-particle level and for non-interacting
systems [2] but much less understood for interacting many-body systems, where
quantum noise can reveal the non-local correlations and entanglement of the
underlying many-body states [3]. Here, we present the first measurement of the
full distribution functions of quantum noise in an interacting many-body
system. The shot-to-shot statistical properties of interference experiments,
performed with pairs of independent one-dimensional atomic condensates, can be
directly related to the full distribution functions of noise in the system [4].
Probing different system sizes we observe the crossover from quantum noise to
thermal noise, reflected in a characteristic change in the distribution
functions from Gumbel-type to Poissonian, in excellent agreement with
predictions based on the Luttinger liquid formalism [5-7]. Our results
demonstrate the power of quantum noise analysis as a probe of strongly
correlated systems, and the power of simple ultracold atom systems to
illustrate and ’quantum simulate’ fundamental quantum processes relevant in
many areas of physics. | Source: | arXiv, 0710.1575 | Services: | Forum | Review | PDF | Favorites |
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