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- W3204438304 abstract "Quantum phase estimation (QPE) is one of the most important subroutines in quantum computing. In general applications, current QPE algorithms either suffer an exponential time overload or require a set of - notoriously quite fragile - GHZ states. These limitations have prevented so far the demonstration of QPE beyond proof-of-principles. Here we propose a new QPE algorithm that scales linearly with time and is implemented with a cascade of Gaussian spin states (GSS). GSS are renownedly resilient and have been created experimentally in a variety of platforms, from hundreds of ions up to millions of cold/ultracold neutral atoms. We show that our protocol achieves a QPE sensitivity overcoming previous bounds, including those obtained with GHZ states, and is robustly resistant to several sources of noise and decoherence. Our work paves the way toward realistic quantum advantage demonstrations of the QPE, as well as applications of atomic squeezed states for quantum computation." @default.
- W3204438304 created "2021-10-11" @default.
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- W3204438304 date "2021-10-01" @default.
- W3204438304 modified "2023-10-18" @default.
- W3204438304 title "Quantum Phase Estimation Algorithm with Gaussian Spin States" @default.
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- W3204438304 doi "https://doi.org/10.1103/prxquantum.2.040301" @default.
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