Full distribution functions of quantum noise in an interacting many-body system

@misc{citeulike:2347270, 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.}, author = {Hofferberth, S. and Lesanovsky, I. and Schumm, T. and Schmiedmayer, J. and Imambekov, A. and Gritsev, V. and Demler, E. }, citeulike-article-id = {2347270}, eprint = {0710.1575}, keywords = {atomic-physics, boson, physics, statistics, theory}, month = {Oct}, posted-at = {2008-02-07 00:10:07}, priority = {2}, title = {Full distribution functions of quantum noise in an interacting many-body system}, url = {http://arxiv.org/abs/0710.1575}, year = {2007} }

TY - ELEC ID - citeulike:2347270 L3 - citeulike-article-id:2347270 TI - Full distribution functions of quantum noise in an interacting many-body system N2 - 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. KW - atomic-physics KW - boson KW - physics KW - statistics KW - theory AU - Hofferberth, S AU - Lesanovsky, I AU - Schumm, T AU - Schmiedmayer, J AU - Imambekov, A AU - Gritsev, V AU - Demler, E PY - 2007/Oct/08/ UR - http://arxiv.org/abs/0710.1575 ER -