Arbitrary quantum channel simulation for a superconducting qubit

The open quantum system and its control laid the foundation of quantum mechanical and quantum information theory. Due to the interaction with the environment, the evolution of practical quantum system should be described by a quantum channel, instead of a unitary evolution for a closed quantum system.

The experimental studies on the quantum channel will not only deepen our understanding of the quantum open system, but also improve our ability to control the evolution of a quantum system, which is beneficial for the researches on quantum information and quantum computation. Therefore, the realization of arbitrary operation on a quantum bit, i.e. the simulation of an arbitrary quantum channel, is of great significance.

Recently, a research team lead by Luyan Sun from Tsinghua University collaborates with Chang-Ling Zou from University of Science and Technology of China, realized the arbitrary quantum channel simulation for a single qubit in a superconducting quantum circuit, and realized the arbitrary operation on a quantum bit.

The experiments are based on a three-dimensional microwave cavity and a coupled superconducting transmon qubit, with the cavity serving as the target qubit and transmon serving as an ancillary qubit, the arbitrary repetitive quantum channel simulation on the photonic qubit is realized. I

t is worth mentioning that, they developed a novel experimental scheme to realize the open quantum system control, with only minimum quantum resources of a single ancillary qubit and the real-time quantum feedback technology. Such a scheme can also be generalized to a higher dimension to realize arbitrary qudit channel simulation, which still only requires only single ancillary qubit.

The demonstrated quantum channel simulation can deterministically simulate the quantum bit evolution in an arbitrary physical environment and generated arbitrary quantum mixed state, would play an important role in the future applications, including quantum computation and quantum simulation.

Research Report: "Experimental repetitive quantum channel simulation"

Related Links
Science China Press
Computer Chip Architecture, Technology and Manufacture
Nano Technology News From SpaceMart.com

Tweet

Thanks for being there;
We need your help. The SpaceDaily news network continues to grow but revenues have never been harder to maintain.

With the rise of Ad Blockers, and Facebook - our traditional revenue sources via quality network advertising continues to decline. And unlike so many other news sites, we don't have a paywall - with those annoying usernames and passwords.

Our news coverage takes time and effort to publish 365 days a year.

If you find our news sites informative and useful then please consider becoming a regular supporter or for now make a one off contribution.

SpaceDaily Monthly Supporter
$5+ Billed Monthly

paypal only

SpaceDaily Contributor
$5 Billed Once

credit card or paypal

More stable light comes from intentionally 'squashed' quantum dots
Los Alamos NM (SPX) Jan 11, 2019
Intentionally "squashing" colloidal quantum dots during chemical synthesis creates dots capable of stable, "blink-free" light emission that is fully comparable with the light produced by dots made with more complex processes. The squashed dots emit spectrally narrow light with a highly stable intensity and a non-fluctuating emission energy. New research at Los Alamos National Laboratory suggests that the strained colloidal quantum dots represent a viable alternative to presently employed nanoscale ... read more