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SUMMARY:Entanglement generation with autonomous quantum thermal machines (
 or how quantum thermal machines clearly outperform classical ones
DTSTART:20181116T151500
DTSTAMP:20260505T113028Z
UID:fd82ed811f7381e0fd90685cef24297d511586811b6f22ab5bd87b7a
CATEGORIES:Conferences - Seminars
DESCRIPTION: Dr. Géraldine Haack\nEntanglement is a key phenomenon disti
 nguishing quantum from classical physics\, and is a paradigmatic resource 
 enabling many applications of quantum information science. Generating and
  maintaining entanglement is therefore a central challenge. Decoherence ca
 used by unavoidable interactions of a system with its environment general
 ly degrades entanglement\, and significant effort is invested in minimisin
 g the effect of such dissipation processes in experiments. However\, diss
 ipation can also be advantageous\, and may in fact be exploited for genera
 ting entangled quantum states under the right conditions. This research d
 irection has given rise to the development of reservoir engineering\, but 
 also to autonomous quantum thermal machines. In this talk\, I will presen
 t the functioning  of one of the simplest thermal machine that can genera
 te entanglement\, a machine that we proposed with my colleagues in Geneva
  and Vienna. This machine makes use of an out-of-equilibrium situation to 
 maintain entanglement in the steady-state regime. Remarkably\, these resu
 lts have motivated experimentalists and I will describe an on-going experi
 ment done at ENS Lyon within Circuit QED. \nHowever\, this thermal machin
 e does not allow the generation of entanglement strong enough to violate B
 ell-type inequalities\, necessary for instance for device-independent qua
 ntum information processing. Motivated by this limitation\, we have develo
 ped a new type of thermal machine and I will show you how maximally entan
 gled states can be generated in a heralded way\, thanks to the use of loca
 l filters. Of particular interest\, this machine can be generalized to ar
 bitrary dimension\, allowing for the generation of arbitrary-dimension sin
 glet states and of multipartite entangled states\, such as the GHZ\, the W
  and cluster states.\nThese novel quantum thermal machines are emblematic
  to illustrate how autonomous quantum thermal machines\, running thanks to
  purely dissipative processes\, outperform their classical counterparts. 
 This research also highlights the importance of quantum transport properti
 es to run quantum thermal machines. These examples illustrate the power o
 f thermal machines to create genuine quantum resources.\n \n\nMain refere
 nces:\n- J. Bohr Brask\, G. Haack\, N. Brunner\, M. Huber\, NJP 17 (2015)\
 n- A. Tavakoli\, G. Haack\, M. Huber\, N. Brunner\, J. Bohr Brask\, Quantu
 m 2 (2018)\n \nAbout the research of the speaker: https://www.unige.ch/s
 ciences/quantumcorrelations/index.php/members1/geraldine-haack/\n 
LOCATION:CE 1 5 https://plan.epfl.ch/?room==CE%201%205
STATUS:CONFIRMED
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