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UID:DSC-13378
DTSTART;TZID=Europe/Berlin:20170925T163000
SEQUENCE:1506326445
TRANSP:OPAQUE
DTEND;TZID=Europe/Berlin:20170925T173000
URL:https://dresden-science-calendar.de/calendar/de/detail/13378
LOCATION:MPI-PKS\, Nöthnitzer Straße 3801187 Dresden
SUMMARY:Lewenstein: Quantum Metrology and Quantum Nonlocality
CLASS:PUBLIC
DESCRIPTION:Speaker: Maciej Lewenstein\, ICFO and ICREA\, Barcelona\, Spain
 \nInstitute of Speaker: \nTopics:\nPhysik\n Location:\n  Name: MPI-PKS (Se
 minarroom 1+2+3)\n  Street: Nöthnitzer Straße 38\n  City: 01187 Dresden\
 n  Phone: + 49 (0)351 871 0\n  Fax: \nDescription: One of the most importa
 nt steps in the understanding of quantum many-body systems is due to the i
 ntensive studies of their entanglement properties [1\,2]. Much less\, howe
 ver\, is known about the role of quantum nonlocality [3] in these systems.
  This is because standard many body observables involve correlations among
  few particles\, while there is no multipartite Bell inequality for this s
 cenario. In my talk I will attempt to connect challenges of quantum metrol
 ogy with those of detection of quantum nonlocality in many body systems. F
 irst\, I will discuss an intimate relation between entanglement in many bo
 dy states and usefulness for metrology [3]. I will focus then on usefulnes
 s of random symmetric states for metrology [4]. The second part will be de
 voted to non-locality.  In the second part\, I will first discuss shortly 
 the role of entanglement in many body systems\, stressing the difference b
 etween the gapped and critical systems. I will then concentrate on the res
 ults of Refs. [6]\, where we provide the first examples of nonlocality det
 ection in many-body systems using two-body correlations. To this aim\, we 
 construct families of multipartite Bell inequalities that involve only sec
 ond order correlations of local observables. We then provide examples of s
 ystems\, relevant for nuclear and atomic physics\, whose ground states vio
 late our Bell inequalities for any number of constituents. We identify ine
 qualities that can be tested by measuring collective spin components\, ope
 ning the way to the experimental detection of many-body nonlocality\, for 
 instance with atomic ensembles [7]\, systems of trapped ions [8]\, or atom
 s trapped close to nano-structured (tapered) fibers and photonic crystals 
 [9]. Interestingly\, breaking of many body Bell inequalities witnesses cer
 tain kinds of many body entanglement [10]. Most of examples will deal with
  symmetric states\, i.e. will call for metrological applications. If time 
 permits\, we discuss non-locality in 1D spin-chains\, by employing Jordan-
 Wigner transformation and relation to integrable and non-integrable fermio
 nic models [11].   References [1] A. Osterloh et al.\, Nature 416\, 608 (2
 002)\; T. J. Osborne et al.\, Quantum Inf. Proc. 1\, 45 (2002)\; Phys. Rev
 . A 66\, 032110 (2002)\; G. Vidal et al.\, Phys. Rev. Lett. 90 227902 (200
 3). [2] M. Lewenstein\, A. Sanpera\, and V. Ahufinger\, “Ultracold atoms
  in Optical Lattices: simulating quantum many body physics”\, Oxford Uni
 versity Press\, Oxford\, 2017\, ISBN 978-0-19-878580-4. [3] J. S. Bell\, P
 hysics 1\, 195-200 (1964). [4] R. Augusiak\, J. Kolodynski\, A. Streltsov\
 , M. N. Bera\, A. Acín\, M. Lewenstein\, Asymptotic role of entanglement 
 in quantum metrology\, Phys. Rev. A 94\, 012339 (2016). [5] M. Oszmaniec\,
  R. Augusiak\, C. Gogolin\, J. Kolodynski\, A. Acín\, and M. Lewenstein\,
  Random bosonic states for robust quantum metrology\, Phys. Rev. X 6\, 041
 044 (2016). [6] J. Tura et al.\, Detecting the non-locality of quantum man
 y body states\, Science 344\, 1256 (2014)\; J. Tura et al.\, Nonlocality i
 n many-body quantum systems detected with two-body correlators\, Ann. Phys
 . 362\, 370-423 (2015).  [7] K. Hammerer et al.\, Rev. Mod. Phys. 82\, 104
 1 (2010). K. Eckert et al.\, Nature Phys. 4\, 50 (2008). [8] T. Graß and 
 M. Lewenstein\, Trapped-ion quantum simulation of tunable-range Heisenberg
  chains\, arXiv:1401.6414\, EPJ Quantum Technology 2014\, 1:8\, doi:10.118
 6/epjqt8. [9] J. S. Douglas\, H. Habibian\, C.-L. Hung\, A. V. Gorshkov\, 
 H. J. Kimble\, and D. E. Chang\, Quantum many-body models with cold atoms 
 coupled to photonic crystals\, Nature Photon. 9\, 326-331 (2015) [10] A. A
 loy et al.\, Device Independent Entanglement Depth Witnesses\, in preparat
 ion. [11] J. Tura\, G. de las Cuevas\, R. Augusiak\, M. Lewenstein\, A. Ac
 ín\,\, and J. I. Cirac\, Energy as a detector of nonlocality of many-body
  spin systems\, Phys. Rev. X7\, 021005 (2017)
DTSTAMP:20260905T092811Z
CREATED:20170830T074248Z
LAST-MODIFIED:20170925T080045Z
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