Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session R42: Progress in Quantum ThermodynamicsInvited
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Sponsoring Units: DQI GSNP Chair: Mohammad Ansari, Forschungszentrum Julich Room: LACC 502B |
Thursday, March 8, 2018 8:00AM - 8:36AM |
R42.00001: Progress in Thermodynamics of Superconducting and Hybrid Circuits Invited Speaker: Jukka Pekola I discuss our experiments on thermodynamics employing both single-electron circuits and superconducting qubits. |
Thursday, March 8, 2018 8:36AM - 9:12AM |
R42.00002: Fluctuation Theorem for Many-Body Pure Quantum States Invited Speaker: Takahiro Sagawa Thermodynamics of quantum systems has attracted much attention in light of the development of modern theories and the state-of-the-art experimental technologies. Especially, it has been established that the second law of thermodynamics is a direct consequence of the fluctuation theorem. However, the standard approach of quantum thermodynamics is based on the canonical ensemble, and the second law for pure quantum states is yet to be understood. In the present work [1], we have proved the second law and the fluctuation theorem for pure quantum states in the short time regime. In our setup, the entire system obeys unitary dynamics, where the initial state of the heat bath is a single energy eigenstate that satisfies the eigenstate-thermalization hypothesis. Our proof is mathematically rigorous, where the Lieb-Robinson bound plays a crucial role. We confirmed our theory by numerical simulation of hard-core bosons, and observed the dynamical crossover from thermal fluctuations to bare quantum fluctuations. Our result would reveal a universal scenario that the second law emerges from quantum mechanics. |
Thursday, March 8, 2018 9:12AM - 9:48AM |
R42.00003: Strong coupling quantum thermodynamics and beyond Invited Speaker: Q. Jens Eisert It is virtually impossible to overstate the importance of thermodynamics for our scientific understanding of physical systems. It accurately describes the behavior of systems consisting of an enormous number of constituents, like particles of a gas in a container, while requiring only a handful number of parameters such as pressure, volume and temperature to capture the essential features of the system. It seems fair to say that no other physical theory has so wide ranged applications and is valid for such a prolific spectrum of settings and physical systems. Having said that, the basic laws have originally been guided by the functioning of macroscopic machines, devices to which the laws of classical physical apply. But what happens if we consider smaller and smaller devices and machines? What if the machines are so small that no longer classical physics is reasonably applicable, but quantum laws and effects are expected to play an important role? In recent years, it is increasingly appreciated that thermodynamic and statistical laws have to be carefully reconsidered in this situation. Then indeed notions of entanglement and other correlations matter, and so do fluctuations and quantities beyond first moments, as well as limits to control. In this talk, I will on the one hand review recent developments in the emergent field of quantum thermodynamics. On the other hand, I will present recent own results on strong coupling corrections in quantum thermodynamics and the emergence of statistical ensembles without invoking any notion of typicality. |
Thursday, March 8, 2018 9:48AM - 10:24AM |
R42.00004: Thermoelectrics of interacting nanosystems - Exploiting fermion-parity superselection instead of time-reversal symmetry Invited Speaker: Janine Splettstoesser The electronic heat current through quantum dots with strong onsite Coulomb interaction can show surprising features of attractive interaction. This is manifested prominently at the electron-hole symmetric point, where, in systems with attractive interaction, a two-particle resonance would occur. One well-known example for this is the Seebeck thermopower in quantum dots, featuring a sign-change at this point, which is standardly interpreted as crossover between two Coulomb resonances. This shows that even the well-studied stationary, linear thermoelectric response of quantum dot systems is still not fully understood. |
Thursday, March 8, 2018 10:24AM - 11:00AM |
R42.00005: Quantum and Information Thermodynamics: A Unifying Framework Based on Repeated Interactions Invited Speaker: Massimiliano Esposito
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