Forum for Science, Industry and Business

Sponsored by:     3M 
Search our Site:

 

Arbitrary quantum channel simulation for a superconducting qubit

14.01.2019

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.


The schematic of the quantum channel simulation based on superconducting quantum system.

Credit: ©Science China Press


The results of arbitrary quantum channel simulation, with the fidelity of single trial of channel simulation is 98.3%.

Credit: ©Science China Press

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.

It 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.

###

This work is supported by the National Key Research and Development Program of China (2017YFA0304303), National Natural Science Foundation of China (11474177), and Anhui Initiative in Quantum Information Technologies (AHY130000).

For more details, see:

Ling Hu, Xianghao Mu, Weizhou Cai, Yuwei Ma, Yuan Xu, Haiyan Wang, Yipu Song, Chang-Ling Zou, Luyan Sun. Experimental repetitive quantum channel simulation, Science Bulletin, 2018, 63(23):1551-1557, doi: 10.1016/j.scib.2018.11.010

https://www.sciencedirect.com/science/article/pii/S2095927318305292

YAN Bei | EurekAlert!
Further information:
http://dx.doi.org/10.1016/j.scib.2018.11.010
https://www.eurekalert.org/pub_releases/2019-01/scp-aqc011119.php

More articles from Physics and Astronomy:

nachricht Scientists see energy gap modulations in a cuprate superconductor
02.04.2020 | DOE/Brookhaven National Laboratory

nachricht BESSY II: Ultra-fast switching of helicity of circularly polarized light pulses
02.04.2020 | Helmholtz-Zentrum Berlin für Materialien und Energie

All articles from Physics and Astronomy >>>

The most recent press releases about innovation >>>

Die letzten 5 Focus-News des innovations-reports im Überblick:

Im Focus: Harnessing the rain for hydrovoltaics

Drops of water falling on or sliding over surfaces may leave behind traces of electrical charge, causing the drops to charge themselves. Scientists at the Max Planck Institute for Polymer Research (MPI-P) in Mainz have now begun a detailed investigation into this phenomenon that accompanies us in every-day life. They developed a method to quantify the charge generation and additionally created a theoretical model to aid understanding. According to the scientists, the observed effect could be a source of generated power and an important building block for understanding frictional electricity.

Water drops sliding over non-conducting surfaces can be found everywhere in our lives: From the dripping of a coffee machine, to a rinse in the shower, to an...

Im Focus: A sensational discovery: Traces of rainforests in West Antarctica

90 million-year-old forest soil provides unexpected evidence for exceptionally warm climate near the South Pole in the Cretaceous

An international team of researchers led by geoscientists from the Alfred Wegener Institute, Helmholtz Centre for Polar and Marine Research (AWI) have now...

Im Focus: Blocking the Iron Transport Could Stop Tuberculosis

The bacteria that cause tuberculosis need iron to survive. Researchers at the University of Zurich have now solved the first detailed structure of the transport protein responsible for the iron supply. When the iron transport into the bacteria is inhibited, the pathogen can no longer grow. This opens novel ways to develop targeted tuberculosis drugs.

One of the most devastating pathogens that lives inside human cells is Mycobacterium tuberculosis, the bacillus that causes tuberculosis. According to the...

Im Focus: Physicist from Hannover Develops New Photon Source for Tap-proof Communication

An international team with the participation of Prof. Dr. Michael Kues from the Cluster of Excellence PhoenixD at Leibniz University Hannover has developed a new method for generating quantum-entangled photons in a spectral range of light that was previously inaccessible. The discovery can make the encryption of satellite-based communications much more secure in the future.

A 15-member research team from the UK, Germany and Japan has developed a new method for generating and detecting quantum-entangled photons at a wavelength of...

Im Focus: Junior scientists at the University of Rostock invent a funnel for light

Together with their colleagues from the University of Würzburg, physicists from the group of Professor Alexander Szameit at the University of Rostock have devised a “funnel” for photons. Their discovery was recently published in the renowned journal Science and holds great promise for novel ultra-sensitive detectors as well as innovative applications in telecommunications and information processing.

The quantum-optical properties of light and its interaction with matter has fascinated the Rostock professor Alexander Szameit since College.

All Focus news of the innovation-report >>>

Anzeige

Anzeige

VideoLinks
Industry & Economy
Event News

13th AKL – International Laser Technology Congress: May 4–6, 2022 in Aachen – Laser Technology Live already this year!

02.04.2020 | Event News

“4th Hybrid Materials and Structures 2020” takes place over the internet

26.03.2020 | Event News

Most significant international Learning Analytics conference will take place – fully online

23.03.2020 | Event News

 
Latest News

Capturing 3D microstructures in real time

03.04.2020 | Materials Sciences

First SARS-CoV-2 genomes in Austria openly available

03.04.2020 | Life Sciences

Do urban fish exhibit impaired sleep? Light pollution suppresses melatonin production in European perch

03.04.2020 | Life Sciences

VideoLinks
Science & Research
Overview of more VideoLinks >>>