Marcin Pawlowski

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In this paper we design a protocol to extract random bits with an arbitrarily low bias from a single arbitrarily weak min-entropy block source in a device independent setting. The protocol employs Mermin devices that exhibit super-classical correlations. Number of devices used scales polynomially in the length of the block n, containing entropy of at least(More)
Semi-device-independent quantum protocols realize information tasks – e.g. secure key distribution, random access coding, and randomness generation – in a scenario where no assumption on the internal working of the devices used in the protocol is made, except their dimension. These protocols offer two main advantages: first, their implementation is often(More)
We present a secure device-independent quantum key distribution scheme based on Hardy's paradox. In comparison with protocols based on Bell inequalities, it has several novel features: (a) The bits used for the secret key do not come from the results of the measurements on an entangled state but from the choices of settings which are harder for an(More)
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