Theoretical Physics

18 February 2015
Time: 14:00 to 15:00

Xiongfeng Ma (Tsinghua University)

Device-independent measurement and its applications

In practice, imperfections in measurement devices may bring false conclusions in quantum information tasks and sometimes lead to disastrous consequences. This is also called detection loophole. In quantum cryptography, imperfect measurement devices open up security loopholes to hacking. This loophole can be solved by making the measurement “device-independent”. That is, the correctness of the experiment conclusion would be independent of physical realizations of the measurement. In this talk, I will discuss some of the recent developments in the experiment demonstrations of the measurement-device-independent quantum key distribution scheme. Meanwhile, the device-independent measurement also finds its applications in other areas, such as entanglement witness. With a measurement-device-independent scheme, we can show that an entanglement witness can be realized without detection loopholes.



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