报告时间：2017年2月24日 星期五 10：00
报告地点：中国科学技术大学近代物理系210会议室
报告人：新加坡南洋理工大学 research fellow Dr. Felix Binder
报告题目：Alternative talk (only in case there is a preference for this topic): Unitary Work Extraction, Quantum Batteries and Powerful Driving
报告摘要：One of the central aims of the emerging field of 'quantum thermodynamics' is to uncover thermodynamic effects which are of a genuinely quantum nature. Quantum mechanics may provide a thermodynamic advantage but also an additional hurdle compared to classical physics. While it has been demonstrated that entangling operations lead to some increase in extractable work I will show that, when power is considered, a much stronger enhancement may be achieved. More specifically, I will compare the optimal power of charging an array of N quantum batteries in parallel to entangling charging of the same array. The ratio between both is called quantum advantage and can be shown to be upper bounded bt √N even in the case of driving between separable states.
Taking the simplest possible model of a quantum battery – a wit (short for ‘work bit’), we present an optimal charging protocol. Extending the analysis again to an array of N wits, we demonstrate quantum advantage with a concrete example. Interestingly, the upper bound may be achieved by entangling operations even in the absence of entanglement at all times during the evolution.
Finally, I will extend the results to Hamiltonians with few-body interactions.
报告人简介：Originally from Karlsruhe, Germany, I did my undergrad in Physics at the University of Munich with an exchange year at EPF Lausanne. My diploma thesis (equivalent to a masters degree) on 'Measures of Mode Entanglement' was with Dieter Jaksch at the University of Oxford where I visited for the last year of my undergraduate degree (2010/11). I graduated from LMU Munich with a diploma in Physics and a degree in digital technology management in December 2011. In 2012 I started my doctoral studies with Vlatko Vedral in Oxford. My thesis was on 'Work, Heat, and Power of Quantum Processes'. It was examined by Mauro Paternostro and Artur Ekert in March 2016. Since April 2016 I'm a research fellow in Mile Gu's group at Nanyang Technological University in Singapore.