Department of Physics

Indian Institute Of Technology Madras , Chennai

Impact of local dynamics on entangling power: Quantum Information Journal Club

Speaker : J. Sai Bhargavi

2017-03-24

Abstract :

It is demonstrated here that local dynamics have the ability to strongly modify the entangling power of unitary quantum gates acting on a composite system. The scenario is common to numerous physical systems, in which the time evolution involves local operators and nonlocal interactions. To distinguish between distinct classes of gates with zero entangling power we introduce a complementary quantity called gate-typicality and study its properties. Analyzing multiple applications of any entangling operator interlaced with random local gates, we prove that both investigated quantities approach their asymptotic values in a simple exponential form. This rapid convergence to equilibrium, valid for subsystems of arbitrary size, is illustrated by studying multiple actions of diagonal unitary gates and controlled unitary gates.

Reference: https://arxiv.org/abs/1611.00479

Key Speaker J. Sai Bhargavi
Guests None
Place Seminar Room
Start Time 3:30 PM
Finish Time 4:30 PM
External Link None