NCTS (South)


DATE2010-03-05

TIME12:00

PLACER203, 2F, NCTS, NCKU

FIELDQuantum Information Science

SPEAKER Dr. Joonwoo Bae - Korea Institute for Advanced Study, Korea

TITLEImpossible Information Processing in Quantum Theory

ABSTRACTQuantum theory describes physics of systems that are dictated by the uncertainty principle, which states that certain pairs of physical properties, like position and momentum, cannot both be known to arbitrary precision. This simply means that certain limitation exists on extracting information from system in the fundamental level. It’s therefore information that can be obtained by observing or dealing with quantum systems.

In this talk, I take the information-theoretic view to quantum theory and consider quantum systems with information processing perspectives. I focus on fundamental theorems in Quantum Information Theory that, i) information cannot be faster than light, ii) quantum states cannot be cloned, and iii) quantum states cannot be perfectly discriminated between. These are called no-go theorems, and I will discuss that they are indeed related one another. I will also discuss what are resulted by the no-go theorems.