Experimental simulation of quantum superchannels

TL;DR

This paper demonstrates an experimental simulation of quantum superchannels using NMR technology, showcasing high accuracy and broad applicability for quantum information processing tasks.

Contribution

It introduces a quantum algorithm for simulating arbitrary superchannels and validates it through high-precision NMR experiments.

Findings

Successful high-accuracy NMR simulation of qubit superchannels

The algorithm applies to arbitrary superchannels

Potential for broader applications in quantum information science

Abstract

Simulating quantum physical processes has been one of the major motivations for quantum information science. Quantum channels, which are completely positive and trace preserving processes, are the standard mathematical language to describe quantum evolution, while in recent years quantum superchannels have emerged as the substantial extension. Superchannels capture effects of quantum memory and non-Markovianality more precisely, and have found broad applications in universal models, algorithm, metrology, discrimination tasks, as examples. Here, we report an experimental simulation of qubit superchannels in a nuclear magnetic resonance (NMR) system with high accuracy, based on a recently developed quantum algorithm for superchannel simulation. Our algorithm applies to arbitrary target superchannels, and our experiment shows the high quality of NMR simulators for near-term usage. Our approach can also be adapted to other experimental systems and demonstrates prospects for more applications of superchannels.