[Theory-Talk] [Talk] 2017/02/15 From Quantumness to Security

[洪琮眩]

Topic: From Quantumness to Security
Speaker: Prof. Xiong-Feng Ma (Institute for Interdisciplinary Information
Sciences)
Date: 2017-02-15 (Wed) 16:00 – 17:20
Location: Auditorium 106 at IIS new Building
Host: Kai-Min Chung
*Abstract:*

Coherence and entanglement are two peculiar features of quantum theory.
Coherence captures the phenomenon of coherent superposition of quantum
states, while entanglement, “the spooky action at a distance”, plays a
crucial role in the nonlocality of quantum mechanics. In this talk, I shall
present two links: between coherence and randomness in quantum random
number generation, and between entanglement and security in quantum key
distribution.

Random numbers play an indispensable role in modern society in various
arenas of finance, cryptography, and computation. Considering individual
and coherent measurement of the correlated party, we show that the
coherence of formation and the relative entropy of coherence measure the
quantum randomness for these two situations, respectively. Furthermore, we
calculate the gap between the two quantum randomness, which turns out to
related another quantum correlation --- discord.

In quantum information processing, entanglement becomes an important
resource for various tasks, such as teleportation, quantum computation, and
cryptography. Intuitively, entanglement means a strong nonlocal correlation
between distant parties, which essentially offers a secure key generation
tool. Various Bell’s inequality test experiments have proved that
eavesdropping (as a local hidden variable) can be fundamentally ruled out.
In this talk, I shall link the basic concept of entanglement with the
security of key distribution.

*BIO:*

Xiongfeng Ma’s main research interest lies on quantum information and
quantum optics, particularly in quantum cryptography and correlation. After
obtaining his BSc at Peking University in 2003, Xiongfeng attended the
University of Toronto for his PhD degree. From 2008 to 2011, he did his
post-doc and visiting positions at the University of Waterloo, the
University of Toronto, and the University of Leeds. In 2012, Xiongfeng
joined Tsinghua University as an assistant professor.
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