Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session B28: Quantum Thermodynamics  from Quantum Information Theory to Statistical MechanicsFocus

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Sponsoring Units: DQI GSNP Chair: Gilad Gour, University of Calgary Room: LACC 405 
Monday, March 5, 2018 11:15AM  11:51AM 
B28.00001: Reversing the Landauer's erasure: information and entropy in mesoscopic thermodynamics Invited Speaker: Dmitri Averin Landauer principle requires that at least k_{B}Tln2 of heat is dissipated into a thermal reservoir at temperature T, when one bit of information is erased from a computing device. It was shown recently that the process of information erasure can be inverted, giving rise to a reversible Maxwell’s demon operating at the limit of thermodynamics efficiency. To extract heat Q from a reservoir and convert it into free energy, such a demon creates the equivalent amount of information, Q/k_{B}Tln2, in its memory. This process was demonstrated experimentally with an electronic Maxwell demon based on the singleelectron box, which extracts k_{B}Tln2 of heat per bit of created information that is encoded in a position of an electron in one of the two electrodes of the box [1]. Reversal of the Landauer’s erasure confirms the interpretation of Landauer principle as a manifestation of the second law of thermodynamics demonstrating that information should be regarded as the entropy of a computing device [2]. 
Monday, March 5, 2018 11:51AM  12:27PM 
B28.00002: Information thermodynamics meets technology Invited Speaker: Oscar Dahlsten Information thermodynamics concerns scenarios where observers have extra knowledge beyond that of a thermal observer. Can these ideas contribute to technological performance enhancements? I will describe recent theory and experiment by myself and collaborators suggesting this is indeed possible, including the potential for quantum enhancements. 
Monday, March 5, 2018 12:27PM  12:39PM 
B28.00003: Entanglement Scaling Laws for NonInteracting Fermions in Finite OneDimensional Lattices Alex Cameron , David Feder The structure of entanglement between two subsystems of a manyparticle state contains useful information about many important physical characteristics. In particular, the entanglement entropy of gapped quantum states generally scales as a function of the surface area between the two subsystems, consistent with an informational holographic principle. Notably, the holographic scaling is known to be logarithmically violated for certain systems of noninteracting free fermions, a consequence of the gaplessness of the excitation spectrum. We numerically investigate the scaling of the bipartite entanglement entropy for noninteracting fermions on a onedimensional lattice. A variety of entanglement measures, lattice fillings and lattice geometries are considered. Violation of the holographic scaling is apparent, even in small Bravais lattices where the excitation gap remains nonzero for all finite sizes. The numerical results are compared with calculations for infinite systems. The impact of lattice filling and a band gap on the entanglement scaling is also explored in this context. 
Monday, March 5, 2018 12:39PM  12:51PM 
B28.00004: Efficiency of Solar Cells Enhanced by Quantum Coherence Sangchul Oh Recent studies claim that quantum coherence could break the detail balance limit of a solar cell, socalled the ShockleyQueisser limit. We study how much the efficiency of a solar cell as a quantum heat engine could be enhanced by quantum coherence. In contrast to the conventional approach that a quantum heat engine is in thermal equilibrium with both hot and cold reservoirs, we propose a new master equation approach that the quantum heat engine is in the cold reservoir and the thermal radiation from the hot reservoir is described by the pumping term. This pumping term solves the problem of the incorrect mean photon number of the hot reservoir assumed by the previous studies. By solving the master equation, the currentvoltage and the powervoltage curves of the photocell for different pumping rates are obtained. We find that, as the photon flux increases, the power output of the solar cell increases linearly at first and then becomes saturated, but the efficiency decreases rapidly. This finding implies that while the power output is enhanced significantly by the quantum coherence via the dark state of the coupled donors, the efficiency is not. 
Monday, March 5, 2018 12:51PM  1:03PM 
B28.00005: Phase diagram of Ising models constructed from hypergraphproduct codes Alexey Kovalev , Sanjay Prabhakar , Leonid Pryadko We study the phase diagram of random bond Ising models with 
Monday, March 5, 2018 1:03PM  1:15PM 
B28.00006: Identification of Extended Hubbard Model SDWBOWCDW phase boundaries using Central Charge Jon Spalding , Shanwen Tsai In this talk, we apply tools from quantuminformation theory to locate phase boundaries of the halffilled extended Hubbard model. With DMRG, we compute the ground state wavefunctions, and then fit the CalabreseCardy entropy scaling relation to identify conformal critical points. 
Monday, March 5, 2018 1:15PM  1:27PM 
B28.00007: Circuit QED Lattices in Hyperbolic Space Alicia Kollar , Mattias Fitzpatrick , Andrew Houck The field of circuit QED has seen dramatic progress in the field of quantum simu lation with one of the exciting applications being the simulation of artificial materials for microwave photons. However, the physics of lattices of CPW resonators is purely determined by the connectivity of the resonators. This means that it is possible to construct networks of resonators which cannot be made from ordinary materials. We present one such example where we fabricate a twodimensional periodic lattice in a hyperbolic space of constant negative curvature. This lattice constitutes an artificial material which exists in a fictitious very high gravitational field, and particles in the lattice propagate along geodesics of the hyperbolic metric, rather than along the standard straight lines of flat Euclidean space. Incorporating highkineticinductance materials or transmon qubits will pave the way to tabletop simulation of interacting and quantum mechanical particles in strong gravity. 
Monday, March 5, 2018 1:27PM  1:39PM 
B28.00008: Speeding up thermalization in quantum thermal engines Sai Vinjanampathy , Nishchay Suri , Felix Binder , Bhaskaran Muralidharan We consider a twostroke 
Monday, March 5, 2018 1:39PM  1:51PM 
B28.00009: On the accuracy of the adiabaticimpulse approximation Michael Tomka , Paolo Zanardi , Lorenzo Campos Venuti We study the adiabaticimpulse approximation as a tool to approximate the time evolution of quantum states when driven through a quantum critical point. The adiabaticimpulse approximation originates from the KibbleZurek (KZ) theory of nonequilibrium classical phase transitions, 
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