Bulletin of the American Physical Society
APS March Meeting 2015
Volume 60, Number 1
Monday–Friday, March 2–6, 2015; San Antonio, Texas
Session T20: Invited Session: Recent Frontiers of Quantum Thermodynamics: From Theory to Experiment |
Hide Abstracts |
Sponsoring Units: GQI DAMOP Chair: Akimasa Miyake, University of New Mexico Room: Ballroom B |
Thursday, March 5, 2015 11:15AM - 11:51AM |
T20.00001: Quantum Quantum-Thermodynamics Invited Speaker: Terence Rudolph The thermodynamic implications of quantization of energy were realized before the full quantum theory was developed, and today its effects are very well (though perhaps not completely) understood. By contrast the thermodynamic implications of quantum coherence, in the myriad guises it can arise, are still encountered in a somewhat piecemeal fashion and are lacking a (coherent!) unified and completely general framework. I will discuss some attempts to provide such a framework using tools of quantum information theory and to explain how thermodynamical constraints on the manipulation of quantum coherence arise. [Preview Abstract] |
Thursday, March 5, 2015 11:51AM - 12:27PM |
T20.00002: Quantum thermalization and the dynamics of entanglement Invited Speaker: David Huse I will address some aspects of how conventional thermodynamics emerges from quantum many-body physics, and also discuss one generic example where it fails to emerge, namely many-body Anderson localization. One aspect of this is the Eigenstate Thermalization Hypothesis (ETH), which suggests alternative statistical-mechanical ensembles that consist of only a single eigenstate of the many-body Hamiltonian. These ensembles, unlike the standard statistical mechancical ensembles, can detect many-body localization and the dynamical phases and quantum phase transitions within the localized phase. I will also discuss the dynamics of many-body quantum entanglement. [Preview Abstract] |
Thursday, March 5, 2015 12:27PM - 1:03PM |
T20.00003: Single ion heat engine Invited Speaker: Kilian Singer An experimental realization of a heat engine with a single ion is presented, which will allow for work extraction even with non-classical thermal reservoirs. To this goal a custom designed linear Paul trap with a single ion performing an Otto cycle is presented. The radial state of the ion is used as the working gas analogous to the gas in a conventional heat engine. The conventional piston is realized by the axial degrees of freedom and the axial motional excitation stores the generated work, just like a conventional fly-wheel. The heat baths can be realized by tailored laser radiation. Alternatively electrical noise can be used to control the state of the ion. The presented system possesses advantageous properties, as the working parameters can be tuned over a broad range and the motional degrees of freedom of the ion can be accurately determined. Dark resonances allow for fast stroboscopic thermometry during the entire working cycle. Monte Carlo simulations are performed to predict the efficiency and the gained work of the working cycle [1]. We have also shown how the equations for the Carnot limit have to be modified if a squeezed thermal reservoir is employed [2]. Furthermore structural phase transitions with laser cooled linear ion crystals are induced verifying the Kibble-Zurek mechanism [3].\\[4pt] [1] O. Abah, J. Ro{\ss}nagel, G. Jacob, S. Deffner, F. Schmidt-Kaler, K. Singer, E. Lutz, Physical Review Letters 109, 203006 (2012).\newline [2] J. Ro{\ss}nagel, O. Abah, F. Schmidt-Kaler, K. Singer, E. Lutz, Physical Review Letters 112, 030602 (2014).\newline[3] S. Ulm, J. Ro{\ss}nagel, G. Jacob, C. Deg\"unther, S. T. Dawkins, U. G. Poschinger, R. Nigmatullin, A. Retzker, M. B. Plenio, F. Schmidt-Kaler, K. Singer, Nature Communications 4, 2290 (2013). [Preview Abstract] |
Thursday, March 5, 2015 1:03PM - 1:39PM |
T20.00004: Cavity Cooling for Ensemble Spin Systems Invited Speaker: David Cory Recently there has been a surge of interest in exploring thermodynamics in quantum systems where dissipative effects can be exploited to perform useful work. One such example is quantum state engineering where a quantum state of high purity may be prepared by dissipative coupling through a cold thermal bath. This has been used to great effect in many quantum systems where cavity cooling has been used to cool mechanical modes to their quantum ground state through coupling to the resolved sidebands of a high-Q resonator. In this talk we explore how these techniques may be applied to an ensemble spin system. This is an attractive process as it potentially allows for parallel remove of entropy from a large number of quantum systems, enabling an ensemble to achieve a polarization greater than thermal equilibrium, and potentially on a time scale much shorter than thermal relaxation processes. This is achieved by the coupled angular momentum subspaces of the ensemble behaving as larger effective spins, overcoming the weak individual coupling of individual spins to a microwave resonator. Cavity cooling is shown to cool each of these subspaces to their respective ground state, however an additional algorithmic step or dissipative process is required to couple between these subspaces and enable cooling to the full ground state of the joint system. [Preview Abstract] |
Thursday, March 5, 2015 1:39PM - 2:15PM |
T20.00005: Experimental investigation of Demon-like Algorithmic Quantum Cooling and its Applications Invited Speaker: Chuan-Feng Li Simulation of the low-temperature properties of many-body systems remains one of the major challenges in theoretical and experimental quantum information science. Firstly we demonstrate experimentally a Demon-like algorithmic cooling method that is applicable to any physical system that can be simulated by a quantum computer. This method allows us to distil and eliminate hot components of quantum states like a quantum Maxwell's demon. The experimental implementation is realized with a quantum optical network, and the results are in full agreement with theoretical predictions (with fidelity higher than 0.978). Secondly, we use the demon-like algorithmic cooling method to experimentally investigate Majorana zero modes exhibiting a fundamental property of non-Abelian statistics. [Preview Abstract] |
Follow Us |
Engage
Become an APS Member |
My APS
Renew Membership |
Information for |
About APSThe American Physical Society (APS) is a non-profit membership organization working to advance the knowledge of physics. |
© 2024 American Physical Society
| All rights reserved | Terms of Use
| Contact Us
Headquarters
1 Physics Ellipse, College Park, MD 20740-3844
(301) 209-3200
Editorial Office
100 Motor Pkwy, Suite 110, Hauppauge, NY 11788
(631) 591-4000
Office of Public Affairs
529 14th St NW, Suite 1050, Washington, D.C. 20045-2001
(202) 662-8700