Speaker | Michele Campisi |
Affiliation | NEST, NANO-CNR |
Date | 2020-10-15 |
Time | 11:00 |
Venue | ONLINE https://meet.google.com/tcu-rsiq-dfb |
Host | Fabio Taddei and Stefan Heun |
The D-wave processor is a partially controllable open quantum system that exchanges energy with its surrounding environment (in the form of heat) and with the external time dependent control fields (in the form of work). Despite being rarely thought as such, it is a thermodynamic machine. Here we investigate the properties of the D-Wave quantum annealers from a thermodynamical perspective. We performed a number of reverse-annealing experiments on the D-Wave 2000Q via the open access cloud server Leap, with the aim of understanding what type of thermal operation the machine performs, and quantifying the degree of dissipation that accompanies it, as well as the amount of heat and work that it exchanges. The latter is a challenging task in view of the fact that one can experimentally access only the overall energy change occurring in the processor, (which is the sum of heat and work it receives). However, recent results of non-equilibrium thermodynamics (namely, the fluctuation theorem and the thermodynamic uncertainty relations), allow to calculate lower bounds on the average entropy production (which quantifies the degree of dissipation) as well as the average heat and work exchanges. The analysis of the collected experimental data shows that (1) in a reverse annealing process the D-Wave processor works as a thermal accelerator and (2) its evolution involves an increasing amount of dissipation with increasing transverse field.
Fabio Taddei (9038) - fabio.taddei@nano.cnr.it
Stefan Heun (9472) - stefan.heun@nano.cnr.it
Istituto Nanoscienze
Consiglio Nazionale delle Ricerche
PEC: protocollo.nano@pec.cnr.it
Partita IVA 02118311006
Piazza San Silvestro 12
56127 Pisa, Italy
phone +39 050 509418
fax +39 050 509550
Istituto Nanoscienze Consiglio Nazionale delle Ricerche
Piazza San Silvestro 12, I
56127 Pisa
phone +39 050 509525/418
fax +39 050 509550
via Campi 213/A, I
41125 Modena 7
phone +39 059 2055629
fax +39 059 2055651″
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