Revealing hidden quantum steerability using local filtering operations

Tanumoy Pramanik, Young Wook Cho, Sang Wook Han, Sang Yun Lee, Yong Su Kim, Sung Moon

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)


Nonlocal quantum correlation is at the heart of the bizarre nature of quantum physics. While there are various classes of nonlocal quantum correlation, steerability of a quantum state by local measurements provides unique operational features. Here, we theoretically and experimentally investigate the "hidden" property of quantum steerability. In particular, we find that there are initially unsteerable states which can reveal the steerability by using local filters on individual quantum systems. It is remarkable that a certain set of local filters is more effective in revealing steerability than Bell nonlocality whereas there exists another set of filters that is more effective in revealing Bell nonlocality than steerability. This result suggests the structural difference between entanglement and steerability. Finally, we present a counterintuitive result that mixed states originating from nonmaximally pure entangled states can have hidden steerability while the mixed state from a maximally pure entangled state fails to show steerability.

Original languageEnglish
Article number030101
JournalPhysical Review A
Issue number3
Publication statusPublished - 2019 Mar 1

Bibliographical note

Publisher Copyright:
© 2019 American Physical Society.

All Science Journal Classification (ASJC) codes

  • Atomic and Molecular Physics, and Optics


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