期刊
PHYSICAL REVIEW A
卷 96, 期 4, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.96.042327
关键词
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资金
- Oxford Martin School
- Wolfson College, University of Oxford
- EPSRC (UK) [EP/L01405X/1]
- Leverhulme Trust (UK)
- John Templeton Foundation
- EU Collaborative Project TherMiQ [618074]
- COST Action [MP1209]
- NRF, Prime Ministers Office, Singapore
- Ministry of Manpower (Singapore) under its Competitive Research Programme (CRP) [NRF-CRP14-2014-02]
- Key Research Program of Frontier Sciences, CAS [QYZDY-SSW-SLH003]
- National Natural Science Foundation of China [11274289, 11325419, 11374288, 11474268, 61327901, 61225025, 61490711]
- Strategic Priority Research Program (B) of the Chinese Academy of Sciences [XDB01030300]
- Fundamental Research Funds for the Central Universities, China [WK2470000018, WK2470000022]
- National Youth Top Talent Support Program of National High-level Personnel of Special Support Program [BB2470000005]
- EPSRC [EP/L01405X/1] Funding Source: UKRI
- Engineering and Physical Sciences Research Council [1814297, EP/L01405X/1] Funding Source: researchfish
Important properties of a quantum system are not directly measurable, but they can be disclosed by how fast the system changes under controlled perturbations. In particular, asymmetry and entanglement can be verified by reconstructing the state of a quantum system. Yet, this usually requires experimental and computational resources which increase exponentially with the system size. Here we show how to detect metrologically useful asymmetry and entanglement by a limited number of measurements. This is achieved by studying how they affect the speed of evolution of a system under a unitary transformation. We show that the speed of multiqubit systems can be evaluated by measuring a set of local observables, providing exponential advantage with respect to state tomography. Indeed, the presentedmethod requires neither the knowledge of the state and the parameter-encoding Hamiltonian nor global measurements performed on all the constituent subsystems. We implement the detection scheme in an all-optical experiment.
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