Volume 112, Number 3, November 2015
|Number of page(s)||6|
|Published online||24 November 2015|
Measurement-device–independent randomness from local entangled states
1 Center for Computational Natural Sciences and Bio-informatics, IIIT-Hyderabad Gachibowli, Hyderabad 500032, India
2 Optics & Quantum Information Group, The Institute of Mathematical Sciences, C.I.T Campus Tharamani, Chennai 600113, India
Received: 3 June 2015
Accepted: 2 November 2015
Nonlocal correlations are useful for device-independent (DI) randomness certification (Pironio S. et al., Nature (London), 464 (2010) 1021). The advantage of this DI protocol over the conventional quantum protocol is that randomness can be certified even when experimental apparatuses are not trusted. Quantum entanglement is the necessary physical source for the nonlocal correlation required for such DI task. However, nonlocality and entanglement are distinct concepts. There exist entangled states which produce no nonlocal correlation and hence are not useful for the DI randomness certification task. Here we introduce the measurement-device–independent randomness certification task where one has trusted quantum state preparation devices but the mesurement devices are completely unspecified. Interestingly we show that there exist entangled states, with local description, that are a useful resource in such task but are useless in the corresponding DI scenario.
PACS: 03.65.Ud – Entanglement and quantum nonlocality (e.g. EPR paradox, Bell's inequalities, GHZ states, etc.) / 03.67.Ac – Quantum algorithms, protocols, and simulations / 03.67.Dd – Quantum cryptography and communication security
© EPLA, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.