Simulating quantum Schrödinger cats in ion-traps - Prof. P. D. Drummond
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报告题目：
Simulating quantum Schrödinger cats in ion-traps - Prof. P. D. Drummond
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报 告 人：
Prof. P. D. Drummond,
Centre for Atom Optics and Ultrafast Spectroscopy,
Swinburne University of Technology, Australia
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报告时间：
2013 年6 月3 日，下午1:00
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报告地点：
物理楼 南506
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联系人：
何琼毅（59367）
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摘要：
How can we simulate the quantum Schrödinger cat? To prove it has quantum
properties, we would like to demonstrate a macroscopic Bell violation, in a
macroscopic superposition experiment as in an ion trap. Direct calculation of
macroscopic superposition of ions involves astronomically large Hilbert spaces. Can
we use random sampling to overcome this complexity?
The answer is to follow the example of French impressionist Georges Seurat. The
quantum state can be represented tomographically as a random assembly of
coherent ‘pixels’, each giving part of the story, just like a pointillist painting. We
calculate scaling properties of SU(2) Q-function sampling for up to 60 ions in a
Mermin-GHZ Schrodinger Cat' state. This is an extension to a much larger size
than the remarkable ion trap experiments of last year's Nobel Laureate, Dave
Wineland. We show that random sampling methods are indeed able to represent a
Bell violation, using GPU supercomputers for increased speed.
Surprisingly, we show that the random sampling method using SU(2) coherent state
phase-space is exponentially FASTER than experiment, which is the opposite to the
usual expected behavior for quantum simulations.
