ITP-quantumseminare

itp-quantumseminare@lists.phys.ethz.ch

April 2011

4 participants
12 discussions

* CHANGE OF TIME & LOCATION * Seminar Talk by Philippe Faist
by Stefan Wolf 01 Apr '11

01 Apr '11

Hi, The time and location of the seminar talk next Tuesday have been changed as follows. (The reason is an Inaugural Lecture at 17:15 in Audimax.) * Tuesday, April 5, 15:30, CAB H 53. * Best regards, Stefan -------- Original-Nachricht -------- Betreff: Seminar Talk by Philippe Faist Datum: Fri, 1 Apr 2011 10:59:02 +0200 Von: Stefan Wolf <wolf(a)inf.ethz.ch> An: <itp-quantumseminare(a)phys.ethz.ch>, Philippe Faist <pfaist(a)student.ethz.ch> Hi, Next week's seminar talk will be by Philippe Faist, who will talk about his M.Sc. work in Renato's group: Tuesday, April 5, 17:00, HIT J 51. Best regards, Stefan ____________________________________________ Title: Thermodynamic State Preparation Abstract: We analyze the work costs of processes that prepare arbitrary given states on quantum systems using a heat bath. We use an eﬀective model approach where speciﬁc elementary operations are postulated, namely the application of an arbitrary unitary, the thermalization with a heat bath, and the adiabatic raising or lowering of individual energy levels of the Hamiltonian. Several explicit processes are analyzed, all of which exhibit a work cost structure with a cost term corresponding to the erasure of the initial system, as given by Landauer’s principle, and an extracted work term related to the preparation of the ﬁnal state. We then consider a second system, a memory, that we want to correlate with the system in the preparation of a joint state. A `brutal' approach performs optimally in the i.i.d. limit, exactly compensating the work cost of the erasure process proposed in [del Rio, L. et al., arXiv:1009.1630, 2010] and thus proving both processes’ optimality in this regime. In the single-shot scenario, the work cost is given by the conditional min entropy under the assumption that the memory only contains information about the system to be prepared. In general, correlations between the memory and other systems cannot be preserved. ____________________________________________ --- ETH Zurich Quantum Seminar List To subscribe/unsubscribe go to: https://webmail.phys.ethz.ch/mailman/listinfo/itp-quantumseminare

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Seminar Talk by Philippe Faist
by Stefan Wolf 01 Apr '11

01 Apr '11

Hi, Next week's seminar talk will be by Philippe Faist, who will talk about his M.Sc. work in Renato's group: Tuesday, April 5, 17:00, HIT J 51. Best regards, Stefan ____________________________________________ Title: Thermodynamic State Preparation Abstract: We analyze the work costs of processes that prepare arbitrary given states on quantum systems using a heat bath. We use an eﬀective model approach where speciﬁc elementary operations are postulated, namely the application of an arbitrary unitary, the thermalization with a heat bath, and the adiabatic raising or lowering of individual energy levels of the Hamiltonian. Several explicit processes are analyzed, all of which exhibit a work cost structure with a cost term corresponding to the erasure of the initial system, as given by Landauer’s principle, and an extracted work term related to the preparation of the ﬁnal state. We then consider a second system, a memory, that we want to correlate with the system in the preparation of a joint state. A `brutal' approach performs optimally in the i.i.d. limit, exactly compensating the work cost of the erasure process proposed in [del Rio, L. et al., arXiv:1009.1630, 2010] and thus proving both processes’ optimality in this regime. In the single-shot scenario, the work cost is given by the conditional min entropy under the assumption that the memory only contains information about the system to be prepared. In general, correlations between the memory and other systems cannot be preserved. ____________________________________________

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