A team from the RIKEN Center for Emergent Matter Science, along with collaborators from several Japanese institutions, have successfully produced pairs of spin-entangled electrons and demonstrated, for the first time, that these electrons remain entangled even when they are separated from one another on a chip.
This research could contribute to the creation of futuristic quantum networks operating using quantum teleportation, which could allow information contained in quantum bits–qubits-to be shared between many elements on chip, a key requirement to scale up the power of a quantum computer.
The ability to create non-local entangled electron pairs — known as Einstein-Podolsky-Rosen pairs — on demand has long been a dream.
Russell Deacon, who carried out the work, says, “We set out to demonstrate that spin-entangled electrons could be reliably produced. So far, researchers have been successful in creating entangled photons, since photons are extremely stable and do not interact. Electrons, by contrast, are profoundly affected by their environment. We chose to try to show that electrons can be entangled through their spin, a property that is relatively stable.”
To perform the feat, Deacon and his collaborators began the painstaking work of creating a tiny device, just a few hundred nanometers in size. The idea was to take a Cooper pair—a pair of electrons that allows electricity to flow freely in superconductors—and get them, while tunneling—a quantum phenomenon—across a junction between two superconductor leads, to pass through two separate “quantum dots”—small crystals that have quantum properties. “If we could detect a superconducting current, this would mean that the electrons, which can be used as quantum bits—the qubits, or bits used in quantum computing—remain entangled even when they have been separated between the quantum dots. We confirm this separation by measuring a superconducting current that develops when they split and are recombined in the second lead.”
The quantum dots, each around 100 nanometers in size, were grown at random positions on a semiconductor chip. This chip was painstakingly examined using an atomic force microscope to discover pairs of dots that were close enough that they might function properly. “We observed thousands of dots and identified around a hundred that were suitable. From these we made around twenty devices. Of those just two worked.”
By measuring the superconducting current, the team was able to show clearly that the spin of the electrons remained entangled as they passed through the separate quantum dots.
“Since we have demonstrated that the electrons remain entangled even when separated,” says Deacon, “this means that we could now use a similar, albeit more complex, device to prepare entangled electron pairs to teleport qubit states across a chip.”
Read more: Producing spin-entangled electrons
The Latest on: Quantum network
via Google News
The Latest on: Quantum network
- Mikko Möttönen Receives Nokia Foundation Award for Quantum Computing Researchon November 30, 2020 at 9:47 am
Nokia Foundation has granted its 2020 Recognition Award to Mikko Möttönen, D.Sc. (Tech), Professor of Quantum Technology ...
- IBM Cloud gets quantum-resistant cryptographyon November 30, 2020 at 7:05 am
IBM Corp. is looking to make enterprise workloads deployed on its public cloud resistant to tomorrow’s encryption-breaking quantum computers. As a first step to that end, the company today introduced ...
- IBM offers quantum-safe cryptography support for key management and app transactions in the cloudon November 30, 2020 at 6:34 am
IBM brings hybrid cloud leadership together with quantum and security research expertise to stay at the forefront of quantum cybersecurity.
- IBM Cloud Delivers Quantum-Safe Cryptography and Hyper Protect Crypto Services to Help Protect Data in the Hybrid Eraon November 30, 2020 at 5:05 am
IBM today announced a series of cloud services and technologies designed to help clients maintain the highest available level of cryptographic key encryption protection to help protect existing data ...
- Mphasis Announces Quantum Computing Framework and Consulting Serviceson November 30, 2020 at 4:00 am
PRNewswire/ -- Mphasis (BSE: 526299) (NSE: MPHASIS), an Information Technology (IT) solutions provider specializing in cloud and cognitive services, ...
- QuTech, KPN, SURF and OPNT join forces to build a quantum networkon November 26, 2020 at 10:02 am
The project will focus on connecting different quantum processors, a significant distance apart, over a Dutch network.
- Xanadu, MaRS, Creative Destruction Lab launch Canada’s first quantum networkon November 26, 2020 at 8:36 am
Toronto-based quantum computing startup Xanadu, in partnership with MaRS and Creative Destruction Lab (CDL), announced the launch of a new quantum network.
- QuTech, KPN, Surf, OPNT start quantum network projecton November 25, 2020 at 8:29 am
QuTech, a collaboration between the Technical University of Delft and Dutch research institute TNO, has started a new project with KPN, Dutch research network Surf and OPNT, a spin-off of Laser LaB ...
- Quantum computing: Aliro wants to make quantum hardware more accessible for software developers and network engineerson November 24, 2020 at 5:00 pm
With Q.COMPUTE and Q.NETWORK, Aliro Quantum is using cloud tech to make it easy for software developers to run quantum programs and networking engineers to build quantum networks.
- Aliro Quantum wants to make quantum easier for software developers and network engineerson November 24, 2020 at 6:06 am
Dr. Prineha Narang, Ph.D., CTO and co-founder of Aliro Quantum, talks with TechRepublic's Bill Detwiler about how the company's Q.COMPUTE and Q.NETWORK cloud platforms can help developers and ...
via Bing News