您现在的位置是:Photon emitting 'light >>正文
Photon emitting 'light
上海品茶网 - 夜上海最新论坛社区 - 上海千花论坛5人已围观
简介By subscribing, you agree to our Terms of Use and Policies You may unsubscribe at any time.A Ph.D. c...
By subscribing, you agree to our Terms of Use and Policies You may unsubscribe at any time.
A Ph.D. candidate at has developed an innovative technique for creating the elementary building blocks of a future quantum computer or internet in a more controlled manner, opening up a potential solution to many of the challenges along the road to this long-sought technology.
Petr Steindl’s doctoral thesis, which he defended last week as the final step in his Ph.D. program at Leiden University in Germany, explores a new technique for generating photons using quantum dots and microcavities.
“Simply speaking, a quantum dot is a little island of semiconducting material,” Steindl said in a Leiden University statement. “Because it is only a few nanometers in size it feels quantum effects, just like an atom.”
See AlsoSometimes called artificial atoms, quantum dots offer a more controllable way to explore quantum phenomena, making them ideal for the task of emitting single photons from a material.
To do this, Steindl put this semiconducting ‘island’ in a microcavity, which is a hole only a few nanometers across so that it only allows precise wavelengths of light to pass through it.
“You can imagine this cavity as two mirrors facing each other,” Steindl said. “Laser light bounces back and forth between them. The quantum dot does not like interacting with light, but the optical cavity makes it more likely because the laser passes the dot many times.”
This light eventually interacts with electrons in the quantum dot, and this is where things get interesting for quantum computer researchers.
“The resonant laser excites an electron in the quantum dot from its ground energy state to a higher one,” Steindl said. “When it falls back to the ground state, the quantum dot emits a single photon. The microcavity conveniently directs this photon toward the rest of our setup.”
Separating the photon from the laser is challenging since it is of the same wavelength as the laser, but that can also be addressed according to Steindl.
“The challenge, however, is to separate this photon from the laser light. It has the same wavelength as the laser but a slightly different polarisation. You can exploit that property to isolate the photon.”
Single photons can then be used in all kinds of other technology, especially in quantum computing applications where single photons can have powerful quantum effects.
“We know that single photons are useful for security and authentication,” Steindl said. “For example, you can send two identical single photons from different locations on a beam splitter. If these photons arrive in an altered state or not simultaneously, you know there was an eavesdropper.”
“I find it totally amazing to build these light structures,” Steindl added. “The fact that it is possible to do this at all is mind-boggling. That we can understand physics at such a deep level. Although it is fascinating, the potential for quantum applications almost seems like a side-effect to me.”
Tags:
转载:欢迎各位朋友分享到网络,但转载请说明文章出处“上海品茶网 - 夜上海最新论坛社区 - 上海千花论坛”。http://www.jz08.com.cn/news/89111.html
相关文章
SEC sues Binance and CZ for breaking US Securities Rules
Photon emitting 'lightKey takeawaysThe US SEC has sued Binance for breaking securities rules.The regulatory agency has als...
阅读更多
Bitrue partners with Xahau Ledger to drive innovation in the XRPL Ecosystem
Photon emitting 'lightBitrue and Xahau Ledger are collaborating to drive innovation in the XRPL Ecosystem.Xahau Ledger has...
阅读更多
Jack Dorsey’s TBD launches decentralized web platform Web5
Photon emitting 'lightThe new platform is designed to give users more control over their data and identityWeb5 is also tar...
阅读更多
热门文章
- 5 top automotive technologies showcased at CES 2024
- Brazil and the Central African Republic latest countries to pass crypto bills
- How ESA's Gaia telescope and stellar music help astronomers measure the universe
- Toncoin rallies after Telegram endorses the TON project
- This new recyclable wind turbine blade has Elium resin in it
- FLOW declines by 5% in the last 24 hours
最新文章
Highlights May 12: TerraUSD recovers, Tether peg collapses
Top 4 Terra
Coinbase secures registration with the Bank of Spain
Jack Dorsey’s TBD launches decentralized web platform Web5
Market takes downturn, 0x rallies on $70M funding round
Securities Commission Malaysia (SC) orders Huobi Global to stop operations