Bulletin of the American Physical Society
APS March Meeting 2018
Volume 63, Number 1
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session V42: Open Quantum SystemsInvited
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Sponsoring Units: DAMOP DQI Chair: Lincoln Carr, Colorado Sch of Mines Room: LACC 502B |
Thursday, March 8, 2018 2:30PM - 3:06PM |
V42.00001: Controlled open system dynamics in AMO quantum simulators Invited Speaker: Andrew Daley
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Thursday, March 8, 2018 3:06PM - 3:42PM |
V42.00002: Dynamics of single and many-body open quantum systems beyond the Markov approximation Invited Speaker: Ines de Vega Open quantum systems (OQS) cannot always be described with the Markov approximation, which requires a large separation of system and environment time scales. In this talk, I will give an overview of some of the most important techniques available to tackle the dynamics of an OQS beyond such Markov approximation. I will place special emphasis on methods based on solving the dynamics of both the system and its environment, and discuss some relevant applications where non-Markovian effects are important, such as atoms coupled to a one dimensional electromagnetic field. In addition, I will discuss the dynamics of non-correlated and strongly correlated many-body open systems, as well as the interplay between the system correlation strength and the dissipation. |
Thursday, March 8, 2018 3:42PM - 4:18PM |
V42.00003: Saving the Quantum: How to make friends with the Environment Invited Speaker: Sabrina Maniscalco Since decades, physicists working with quantum technologies have been trying to model, understand and counter the loss of quantum properties caused by the environment interacting with quantum systems. Very sophisticated experiments nowadays permit to isolate quantum devices for intervals of times long enough to operate in quantum-powered mode. A general rule of thumb has been: the longer the quantum device interacts with its ever-present environment, the worse will its efficiency be. |
Thursday, March 8, 2018 4:18PM - 4:54PM |
V42.00004: Multimode resources based on optical frequency combs and implementation of quantum complex networks. Invited Speaker: Valentina Parigi Recently, quantum complex networks, i.e. collections of quantum systems in a non-regular topology, have been explored leading to significant progress in a multitude of diverse contexts including, e.g., quantum transport, open quantum systems, quantum communication, extreme violation of local realism, and quantum gravity geometries. However, the question on how to produce and control general quantum complex networks in experimental laboratory has remained open. The Multimode Quantum Optics group at Laboratoire Kastler Brossel developed in the last years experimental multimode systems based on parametric processes pumped by optical frequency combs. The spectrum of these lasers is constituted by hundreds of thousands of frequencies components. The parametric process in the non-linear crystal couples all these optical frequencies, and generates non-trivial multimode Gaussian quantum states. This strategy demonstrated its potential in multipartite entangled states and cluster states generation [1]. Here we address a more general scenario and a specific mapping, with additional tools, including pulse shaping and multimode measurements for the implementation of quantum complex networks [2]. The scheme allows for the arbitrary control of a large number of the nodes (optical modes) and topology of the links (interactions between the modes) within the network. We describe the dynamics within the complex network of coupled harmonic oscillators and then show in detail how this can be mapped to the optical platform. We finally discuss the implementation of a probing technique for complex network. [1] J. Roslund, et al., Nat. Commun. 8, 15645 (2017). [2] J. Nokkala, F. Arzani, F. Galve, R. Zambrini, S. Maniscalco, J. Piilo, N. Treps, and V. Parigi arXiv: 1708.08726. |
Thursday, March 8, 2018 4:54PM - 5:30PM |
V42.00005: Bose-Einstein Condensate in a cavity, phase transitions in an open quantum system Invited Speaker: Manuele Landini Ultra-cold gases interacting with the coherent field of an optical cavity represent a well-controlled example of an open quantum system. A Bose-Einstein condensate strongly coupled to the cavity mode can undergo a phase transition to an organized state where the atoms scatter light collectively. This system can be mapped to the Dicke model, realizing a driven-dissipative version of it. I will present our latest results on the extension of the coupling scheme to spinor BECs, leading to the appearance of magnetic correlations in the phase diagram. We explore the competition between two organization patterns in a spin mixture. A density modulated phase competes with a novel organized phase characterized by spin modulations. We explain our findings in the context of an extended Dicke model, with excellent agreement to the experimental observations. The natural dissipation channel provided by photons leaking out of the cavity leads to intriguing consequences for the system's statistical properties at zero temperature and allows for real-time access on the system's dynamics. In the case of the spin mixture, dissipation has strong consequences on the phase diagram resulting in the presence of exceptional points leading to dynamical instabilities. |
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