Unified picture for spatial, temporal, and channel steering

被引:24
作者
Uola, Roope [1 ]
Lever, Fabiano [1 ,2 ]
Guehne, Otfried [1 ]
Pellonpaa, Juha-Pekka [3 ]
机构
[1] Univ Siegen, Walter Flex Str 3, D-57068 Siegen, Germany
[2] Univ Potsdam, Karl Liebknecht Str 24, D-14476 Potsdam, Germany
[3] Univ Turku, Turku Ctr Quantum Phys, FI-20014 Turku, Finland
关键词
JOINT MEASUREMENTS; OBSERVABLES; NONLOCALITY;
D O I
10.1103/PhysRevA.97.032301
中图分类号
O43 [光学];
学科分类号
070207 ; 0803 ;
摘要
Quantum steering describes how local actions on a quantum system can affect another, spacelike separated, quantum state. Lately, quantum steering has been formulated also for timelike scenarios and for quantum channels. We approach all the three scenarios as one using tools from Stinespring dilations of quantum channels. By applying our technique we link all three steering problems one-to-one with the incompatibility of quantum measurements, a result formerly known only for spatial steering. We exploit this connection by showing how measurement uncertainty relations can be used as tight steering inequalities for all three scenarios. Moreover, we show that certain notions of temporal and spatial steering are fully equivalent and prove a hierarchy between temporal steering and macrorealistic hidden variable models.
引用
收藏
页数:6
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