期刊
PHYSICAL REVIEW X
卷 8, 期 3, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevX.8.031013
关键词
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资金
- National Research Foundation of Singapore
- NRF [NRF-NRFF2016-02, NRF-CRP14-2014-02, RF2017-NRF-ANR004 VanQuTe]
- John Templeton Foundation [52095, 54914]
- Foundational Questions Institute [FQXi-RFP-1609]
- Physics of the Observer Grant (Observer-Dependent Complexity: The Quantum-Classical Divergence over 'What Is Complex?') [FQXi-RFP-1614]
- Oxford Martin School
- Singapore Ministry of Education Tier 1 [RG190/17]
- U.S. Army Research Laboratory
- U.S. Army Research Office [W911NF-13-1-0390, W911NF-13-1-0340, W911NF-18-1-0028]
- John Templeton Foundation
- Centre for Quantum Technologies
- Lee Foundation of Singapore
Causal asymmetry is one of the great surprises in predictive modeling: The memory required to predict the future differs from the memory required to retrodict the past. There is a privileged temporal direction for modeling a stochastic process where memory costs are minimal. Models operating in the other direction incur an unavoidable memory overhead. Here, we show that this overhead can vanish when quantum models are allowed. Quantum models forced to run in the less-natural temporal direction not only surpass their optimal classical counterparts but also any classical model running in reverse time. This holds even when the memory overhead is unbounded, resulting in quantum models with unbounded memory advantage.
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