Nav: Home

Arbitrary quantum channel simulation for a superconducting qubit

January 11, 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. 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.
-end-
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

Science China Press

Related Evolution Articles:

Artificial evolution of an industry
A research team has taken a deep dive into the newly emerging domain of 'forward-looking' business strategies that show firms have far more ability to actively influence the future of their markets than once thought.
Paleontology: Experiments in evolution
A new find from Patagonia sheds light on the evolution of large predatory dinosaurs.
A window into evolution
The C4 cycle supercharges photosynthesis and evolved independently more than 62 times.
Is evolution predictable?
An international team of scientists working with Heliconius butterflies at the Smithsonian Tropical Research Institute (STRI) in Panama was faced with a mystery: how do pairs of unrelated butterflies from Peru to Costa Rica evolve nearly the same wing-color patterns over and over again?
Predicting evolution
A new method of 're-barcoding' DNA allows scientists to track rapid evolution in yeast.
Insect evolution: Insect evolution
Scientists at Ludwig-Maximilians-Universitaet (LMU) in Munich have shown that the incidence of midge and fly larvae in amber is far higher than previously thought.
Evolution of aesthetic dentistry
One of the main goals of dental treatment is to mimic teeth and design smiles in the most natural and aesthetic manner, based on the individual and specific needs of the patient.
An evolution in the understanding of evolution
In an open-source research paper, a UVA Engineering professor and her former Ph.D. student share a new, more accurate method for modeling evolutionary change.
Chemical evolution -- One-pot wonder
Before life, there was RNA: Scientists at Ludwig-Maximilians-Universitaet (LMU) in Munich show how the four different letters of this genetic alphabet could be created from simple precursor molecules on early Earth -- under the same environmental conditions.
Catching evolution in the act
Researchers have produced some of the first evidence that shows that artificial selection and natural selection act on the same genes, a hypothesis predicted by Charles Darwin in 1859.
More Evolution News and Evolution Current Events

Trending Science News

Current Coronavirus (COVID-19) News

Top Science Podcasts

We have hand picked the top science podcasts of 2020.
Now Playing: TED Radio Hour

Listen Again: Reinvention
Change is hard, but it's also an opportunity to discover and reimagine what you thought you knew. From our economy, to music, to even ourselves–this hour TED speakers explore the power of reinvention. Guests include OK Go lead singer Damian Kulash Jr., former college gymnastics coach Valorie Kondos Field, Stockton Mayor Michael Tubbs, and entrepreneur Nick Hanauer.
Now Playing: Science for the People

#562 Superbug to Bedside
By now we're all good and scared about antibiotic resistance, one of the many things coming to get us all. But there's good news, sort of. News antibiotics are coming out! How do they get tested? What does that kind of a trial look like and how does it happen? Host Bethany Brookeshire talks with Matt McCarthy, author of "Superbugs: The Race to Stop an Epidemic", about the ins and outs of testing a new antibiotic in the hospital.
Now Playing: Radiolab

Dispatch 6: Strange Times
Covid has disrupted the most basic routines of our days and nights. But in the middle of a conversation about how to fight the virus, we find a place impervious to the stalled plans and frenetic demands of the outside world. It's a very different kind of front line, where urgent work means moving slow, and time is marked out in tiny pre-planned steps. Then, on a walk through the woods, we consider how the tempo of our lives affects our minds and discover how the beats of biology shape our bodies. This episode was produced with help from Molly Webster and Tracie Hunte. Support Radiolab today at Radiolab.org/donate.