Less reality, more security
- Conference date: 20–23 September 2010
- Location: Umhlanga, South Africa
The concept of nonlocality, whereby a local operation on one state can instantaneously affect the properties of another spatially-separated state, has been investigated through the violation of Bell inequalities. Realisations of such violations in the laboratory paved the way for not only experimental justification of quantum theory, but also one of the subject's first significant applications in cryptography. The violation of Bell inequalities can be used as an indicator for security in the task of key distribution. Furthermore, it has more recently been shown that such security is guaranteed by the violations alone, regardless of assumptions about the workings and trustworthiness of the devices provided for the task. We provide a brief history of Bell inequalities and their use in the development of device-independent key distribution, which is less reliant on the validity of quantum theory than previously thought.
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