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Quantum Steering: Experiments and Applications

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Title Quantum Steering: Experiments and Applications
Title of Series The Annual Conference on Quantum Cryptography (QCRYPT) 2012
Number of Parts 30
Author Smith, Devin
Contributors Centre for Quantum Technologies (CQT)
National University of Singapore (NUS)
License CC Attribution - NonCommercial - NoDerivatives 2.5 Switzerland:
You are free to use, copy, distribute and transmit the work or content in unchanged form for any legal and non-commercial purpose as long as the work is attributed to the author in the manner specified by the author or licensor.
DOI 10.5446/36673
Publisher Eidgenössische Technische Hochschule (ETH) Zürich
Release Date 2012
Language English

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Subject Area Information technology
Abstract Quantum steering allows two parties to verify shared entanglement even if one measurement device is untrusted, as well as convincing an unbelieving party of the existence of entanglement. I will discuss quantum steering in the contexts of recent experiments [1,2,3] steering the polarization degree of freedom for single photons. The historical context as well as modern motivation for steering will be covered, as well as the similarities and differences in the various recent experiments. Our own work [1], demonstrating quantum steering with high efficiency (62%) in two measurement bases, will be discussed in detail, including the technical challenges in certifying the results due to measurement imperfections of various types. We ultimately demonstrate a violation of some 48 standard deviations of the steering inequality most relevant to applications, which also happens to be the one most difficult to violate. The efficiency demonstrated in this experiment (62%) is half again as high as the previous world record for detection efficiency for an experiment in this context. I will conclude with our current research project – to implement semi-device-independent quantum key distribution [4], with security guaranteed by a steering inequality. This lies in the gap between current QKD implementations and the ultimate security given by device-independent QKD, and, in practical situations, requires a detection efficiency some 10% higher again than our previous result, which should be achievable given the advances made since that result was published. 1. DH Smith, G Gillett et al., Nat. Commun. 3:625 (2012) 2. AJ Bennet et al., Phys. Rev. X 2, 031003 (2012) 3. B Wittmann, S Ramelow et al., New J. Phys. 14, 053030 (2012) 4. C Branciard et al., Phys. Rev. A 85, 010301(R) (2012)

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