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Experimental Realization of Parrondo's Paradox in 1D Quantum Walks
Author(s) -
Jan Munsif,
Wang QinQin,
Xu XiaoYe,
Pan WeiWei,
Chen Zhe,
Han YongJian,
Li ChuanFeng,
Guo GuangCan,
Abbott Derek
Publication year - 2020
Publication title -
advanced quantum technologies
Language(s) - English
Resource type - Journals
ISSN - 2511-9044
DOI - 10.1002/qute.201900127
Subject(s) - quantum walk , random walk , quantum , realization (probability) , statistical physics , coherence (philosophical gambling strategy) , coin flipping , physics , quantum mechanics , mathematics , quantum algorithm , statistics
The Parrondo effect is a well‐known apparent paradox where a combination of biased random walks displays a counterintuitive reversal in direction. These random walks can be expressed in terms of classical coin tossing games, leading to the surprising result that a combination of losing games can result in a winning game. There is now a large body of literature on quantum walks theoretically analyzing the quantum version of this effect, but to date, there have been no experimental observations of quantum Parrondo walks. Here, the first experimental verification of a quantum Parrondo walk within a quantum optics scenario is demonstrated. Based on the compact large‐scale experimental quantum‐walk platform, two rotation operators are implemented to realize the quantum Parrondo effect. The effect of quantum coherence in a quantum Parrondo walk is also investigated based on a delayed‐choice scheme that cannot be realized with classical light. It is demonstrated that the Parrondo effect vanishes when the quantum walk has a completely decoherent initial state in a delayed‐choice setting. Quantum walks are fundamental to multiple quantum algorithms, and this research provides motivation to expand the results to further explore quantum Parrondo walks.