Nonlocal activation of bound entanglement via local quantum Zeno dynamics

Fatih Ozaydin, Cihan Bayindir, Azmi Ali Altintas, Can Yesilyurt

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6 Citations (Scopus)


Bound entanglement was shown to be activated [P. Horodecki et al., Phys. Rev. Lett. 82, 1056 (1999)10.1103/PhysRevLett.82.1056] in the sense that the entanglement of a spatially separated two-qutrit system can be increased with nonzero probability via a sufficiently large number of preshared bound-entangled states, local three-level controlled operations, and classical communications. Here we present a local quantum Zeno scheme for activating bound entanglement which is based only on single-particle rotations and threshold measurements. In our scheme, neither a large number of bound-entangled states nor controlled operations are required, and classical communication is required only once at the end of the protocol. We show that a single bound-entangled state is sufficient for increasing the negativity of the target entangled state from 0.11 to 0.17, and by using four more bound-entangled states, negativity can be made greater than 0.42 and the fidelity to the maximally entangled state increases from 0.3 to 0.41, 0.50, 0.59, and 0.61. We believe our results are important not only for quantum technologies but also for a better understanding of quantum entanglement.

Original languageEnglish
Article number022439
JournalPhysical Review A
Issue number2
Publication statusPublished - Feb 2022

Bibliographical note

Publisher Copyright:
© 2022 American Physical Society.


F.O. acknowledges financial support from Tokyo International University Personal Research Fund. C.Y. acknowledges support from the Istanbul University Scientific Research Fund through Grant No. BAP-2019-33825.

FundersFunder number
Istanbul University Scientific Research FundBAP-2019-33825
Tokyo International University


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