. 24/7 Space News .
CHIP TECH
Dawn of solid-state quantum networks
by Staff Writers
Bellingham WA (SPX) Jan 01, 2023

Experimental configuration of quantum interference between two independent solid-state QD single-photon sources separated by 302 km fiber. DM: dichromatic mirror, LP: long pass, BP: band pass, BS: beam splitter, SNSPD: superconducting nanowire single- photon detector, HWP: half-wave plate, QWP: quarter-wave plate, PBS: polarization beam splitter. Credit: You et al., doi 10.1117/1.AP.4.6.066003

This year's Nobel Prize in Physics celebrated the fundamental interest of quantum entanglement, and also envisioned the potential applications in "the second quantum revolution" - a new age when we are able to manipulate the weirdness of quantum mechanics, including quantum superposition and entanglement.

A large-scale and fully functional quantum network is the holy grail of quantum information sciences. It will open a new frontier of physics, with new possibilities for quantum computation, communication, and metrology.

One of the most significant challenges is to extend the distance of quantum communication to a practically useful scale. Unlike classical signals that can be noiselessly amplified, quantum states in superposition cannot be amplified because they cannot be perfectly cloned.

Therefore, a high-performance quantum network requires not only ultra-low-loss quantum channels and quantum memory, but also high-performance quantum light sources. There has been exciting recent progress in satellite-based quantum communications and quantum repeaters, but a lack of suitable single-photon sources has hampered further advances.

What is required of a single-photon source for quantum network applications? First, it should emit one (only one) photon at a time. Second, to attain brightness, the single-photon sources should have high system efficiency and a high repetition rate.

Third, for applications such as in quantum teleportation that require interfering with independent photons, the single photons should be indistinguishable. Additional requirements include a scalable platform, tunable and narrowband linewidth (favorable for temporal synchronization), and interconnectivity with matter qubits.

A promising source is quantum dots (QDs), semiconductor particles of just a few nanometers. However, in the past two decades, the visibility of quantum interference between independent QDs has rarely exceeded the classical limit of 50% and distances have been limited to around a few meters or kilometers.

As reported in Advanced Photonics, an international team of researchers has achieved high-visibility quantum interference between two independent QDs linked with ~300 km optical fibers. They report efficient and indistinguishable single-photon sources with ultra-low-noise, tunable single-photon frequency conversion, and low-dispersion long fiber transmission.

The single photons are generated from resonantly driven single QDs deterministically coupled to microcavities. Quantum frequency conversions are used to eliminate the QD inhomogeneity and shift the emission wavelength to the telecommunications band.

The observed interference visibility is up to 93%. According to senior author Chao-Yang Lu, professor at the University of Science and Technology of China (USTC), "Feasible improvements can further extend the distance to ~600 km."

Lu remarks, "Our work jumped from the previous QD-based quantum experiments at a scale from ~1 km to 300 km, two orders of magnitude larger, and thus opens an exciting prospect of solid-state quantum networks." With this reported jump, the dawn of solid-state quantum networks may soon begin breaking toward day.

Research Report:Quantum interference with independent single-photon sources over 300 km fiber


Related Links
International Society for Optics and Photonics
Computer Chip Architecture, Technology and Manufacture
Nano Technology News From SpaceMart.com


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


CHIP TECH
Taiwan's TSMC begins mass production of 3nm chips
Tainan, Taiwan (AFP) Dec 29, 2022
Taiwanese tech giant TSMC said Thursday it had started mass production of its 3-nanometre chips, among the most advanced to come to market. The Taiwan Semiconductor Manufacturing Company operates the world's largest silicon wafer factories and produces high-performance chips used in everything from smartphones and cars to missiles. It is also Apple's primary chip supplier. Its 3nm-process chips are expected to have more processing power while using less power, boosting battery performance. " ... read more

Comment using your Disqus, Facebook, Google or Twitter login.



Share this article via these popular social media networks
del.icio.usdel.icio.us DiggDigg RedditReddit GoogleGoogle

CHIP TECH
Five things to watch at CES tech megashow

Scientific samples, hardware return from the space station for more study

Scientists eager to analyze International Space Station experiments soon

Station crew wraps up a busy year as Soyuz review continues

CHIP TECH
Artemis I Orion spacecraft returns to Kennedy Space Center

Heat shield inspections underway on Artemis I Orion spacecraft

Historic UK rocket mission ends in failure

Sidus Space awarded Bechtel Cable Assembly contract for Mobile Launcher 2

CHIP TECH
A Scuff for the New Year: Sols 3699-3702

Moving along the Marker Band: Sols 3705-3707

A New Year on Mars and a Brand-New Workspace: Sols 3702-3704

MOXIE sets consecutive personal bests and Mars records for oxygen production

CHIP TECH
Space contractors release China's launch plans for 2023

China's first private sector 2023 rocket launch up, up and away

First rocket launch of the New Year leaves Wenchang for space

China not in 'space race', industry insiders say

CHIP TECH
OneWeb to launch 40 satellites with SpaceX

NSLComm's BeetleSat LEO satellite launched on SpaceX Transporter 6 mission

Spire Global launched 6 satellites on SpaceX Transporter-6 Mission

Chinese commercial space company to launch stackable satellites

CHIP TECH
Retired NASA satellite expected to fall to Earth on Sunday

Voyager Space and Airbus announce partnership for Starlab Space Station

Momentus launches Vigoride Orbital Service Vehicle on Transporter-6 Mission

NASA and HAARP conclude asteroid experiment

CHIP TECH
Astronomers use 'little hurricanes' to weigh and date planets around young stars

Assembly begins on NASA's next tool to study exoplanets

What it would take to discover life on Saturn's icy moon Enceladus

Kepler's first exoplanet is spiraling toward its doom

CHIP TECH
PSI Io Input/Output observatory discovers large volcanic outburst on Jupiter's moon Io

SwRI delivers innovative instrument for NASA's Europa Clipper mission

Mix a space juice to celebrate ESA's Juice mission

Juno spacecraft recovering memory after 47th Flyby of Jupiter









The content herein, unless otherwise known to be public domain, are Copyright 1995-2024 - Space Media Network. All websites are published in Australia and are solely subject to Australian law and governed by Fair Use principals for news reporting and research purposes. AFP, UPI and IANS news wire stories are copyright Agence France-Presse, United Press International and Indo-Asia News Service. ESA news reports are copyright European Space Agency. All NASA sourced material is public domain. Additional copyrights may apply in whole or part to other bona fide parties. All articles labeled "by Staff Writers" include reports supplied to Space Media Network by industry news wires, PR agencies, corporate press officers and the like. Such articles are individually curated and edited by Space Media Network staff on the basis of the report's information value to our industry and professional readership. Advertising does not imply endorsement, agreement or approval of any opinions, statements or information provided by Space Media Network on any Web page published or hosted by Space Media Network. General Data Protection Regulation (GDPR) Statement Our advertisers use various cookies and the like to deliver the best ad banner available at one time. All network advertising suppliers have GDPR policies (Legitimate Interest) that conform with EU regulations for data collection. By using our websites you consent to cookie based advertising. If you do not agree with this then you must stop using the websites from May 25, 2018. Privacy Statement. Additional information can be found here at About Us.