(Max Planck Institute of Quantum Optics)

摘要:

Many quantum algorithms rely on the measurement of complex quantum amplitudes.

Standard approaches to obtain the phase information, such as the Hadamard test,

give rise to large overheads due to the need for global controlled-unitary

operations. We introduce a quantum algorithm based on complex analysis that

overcomes this problem for amplitudes that are a continuous function of time.

Our method only requires the implementation of real-time evolution and a

shallow circuit that approximates a short imaginary-time evolution. We show

that the method outperforms the Hadamard test in terms of circuit depth and

that it is suitable for current noisy quantum computers when combined with a

simple error-mitigation strategy.

报告人简介:

Yilun Yang is a PhD student at Max Planck Institute of Quantum Optics (MPQ) 

under the supervision of Prof. Dr. Ignacio Cirac. Before that, he did his 

master in Ludwig-Maximilian University of Munich and Technical University of

Munich. He obtained his bachelor’s degree in University of Chinese Academy 

of Sciences. His research is mainly focused on tensor network algorithms and

quantum simulation.

　地点：M830
联系人: 廖海军 (9377)