Zobrazeno 1 - 10
of 99
pro vyhledávání: '"Michele Campisi"'
Publikováno v:
PRX Quantum, Vol 5, Iss 3, p 030309 (2024)
We study the problem of dynamic cooling whereby a target qubit is cooled at the expense of heating up N−1 further identical qubits by means of a global unitary operation. A standard back-of-the-envelope high-temperature estimate establishes that th
Externí odkaz:
https://doaj.org/article/f598e439135a4dd1b8ba17631199147d
Autor:
Lorenzo Buffoni, Michele Campisi
Publikováno v:
Quantum, Vol 7, p 961 (2023)
We demonstrate an information erasure protocol that resets $N$ qubits at once. The method displays exceptional performances in terms of energy cost (it operates nearly at Landauer energy cost $kT \ln 2$), time duration ($\sim \mu s$) and erasure succ
Externí odkaz:
https://doaj.org/article/5bbdbf4d4c5748e699a10a71b210e0d0
Publikováno v:
New Journal of Physics, Vol 25, Iss 3, p 033030 (2023)
Long-range interacting quantum devices provides a promising route for quantum technology applications. Here, the presence of long-range interactions is shown to enhance the performances of a quantum heat engine featuring a many-body working substance
Externí odkaz:
https://doaj.org/article/d8aed3d037d04cf79f05790a2655f0e3
Publikováno v:
New Journal of Physics, Vol 24, Iss 10, p 103023 (2022)
We study a four-stroke Otto engine whose working fluid is a quantum Ising chain. The thermodynamic cycle consists in sweeps of the transverse magnetic field occurring in thermal isolation, alternated by thermalisation strokes with reservoirs at diffe
Externí odkaz:
https://doaj.org/article/117e843d06f349c4b65b8531204be565
Publikováno v:
PRX Quantum, Vol 2, Iss 3, p 030353 (2021)
Inspired by the idea that quantum computers can be useful in advancing basic science, we use a quantum processor to experimentally validate a number of theoretical results in non-equilibrium quantum thermodynamics, that were not (or were very little)
Externí odkaz:
https://doaj.org/article/0e823abb2bd146aea79d97a52afe1352
Publikováno v:
New Journal of Physics, Vol 23, Iss 6, p 065004 (2021)
The experimental verification of quantum fluctuation relations for driven open quantum system is currently a challenge, due to the conceptual and operative difficulty of distinguishing work and heat. The nitrogen-vacancy (NV) center in diamond has be
Externí odkaz:
https://doaj.org/article/aa47da9a8c2e4dd6bc4fe91dbf692000
Autor:
Michele Campisi, Rosario Fazio
Publikováno v:
Nature Communications, Vol 7, Iss 1, Pp 1-5 (2016)
The second law of thermodynamics says that the efficiency of a heat engine is limited by the Carnot efficiency. Here, the authors use finite-size-scaling theory to investigate whether this ultimate limit can be achieved at finite power using quantum
Externí odkaz:
https://doaj.org/article/fbd3bf2f62d84b339582bf49686b4124
Autor:
Peter Hänggi, Michele Campisi
Publikováno v:
Entropy, Vol 13, Iss 12, Pp 2024-2035 (2011)
The recent development of the theory of fluctuation relations has led to new insights into the ever-lasting question of how irreversible behavior emerges from time-reversal symmetric microscopic dynamics. We provide an introduction to fluctuation rel
Externí odkaz:
https://doaj.org/article/aa20bfa8862a49a2bfd1c1c2095b74c1
Publikováno v:
New Journal of Physics, Vol 19, Iss 5, p 053027 (2017)
A theory of feedback-controlled heat transport in quantum systems is presented. It is based on modelling heat engines as driven multipartite systems subject to projective quantum measurements and measurement-conditioned unitary evolutions. The theory
Externí odkaz:
https://doaj.org/article/3a6cc7362b394c4a83b66f4cae5739c8
Publikováno v:
New Journal of Physics, Vol 17, Iss 3, p 035012 (2015)
We study stochastic energetic exchanges in quantum heat engines. Due to microreversibility, these obey a fluctuation relation, called the heat engine fluctuation relation, which implies the Carnot bound: no machine can have an efficiency greater than
Externí odkaz:
https://doaj.org/article/073a60d90e2d4e0f80fb2fce69ad0df2