A silicon-based quantum computing device could be closer than ever due to a new experimental device that demonstrates the potential to use light as a messenger to connect quantum bits of information — known as qubits — that are not immediately adjacent to each other. The feat is a step toward making quantum computing devices from silicon, the same material used in today’s smartphones and computers.
The research, published in the journal Nature, was led by researchers at Princeton University in collaboration with colleagues at the University of Konstanz in Germany and the Joint Quantum Institute, which is a partnership of the University of Maryland and the National Institute of Standards and Technology.
The team created qubits from single electrons trapped in silicon chambers known as double quantum dots. By applying a magnetic field, they showed they could transfer quantum information, encoded in the electron property known as spin, to a particle of light, or photon, opening the possibility of transmitting the quantum information.
“This is a breakout year for silicon spin qubits,” said Jason Petta, professor of physics at Princeton. “This work expands our efforts in a whole new direction, because it takes you out of living in a two-dimensional landscape, where you can only do nearest-neighbor coupling, and into a world of all-to-all connectivity,” he said. “That creates flexibility in how we make our devices.”
Quantum devices offer computational possibilities that are not possible with today’s computers, such as factoring large numbers and simulating chemical reactions. Unlike conventional computers, the devices operate according to the quantum mechanical laws that govern very small structures such as single atoms and sub-atomic particles. Major technology firms are already building quantum computers based on superconducting qubits and other approaches.
“This result provides a path to scaling up to more complex systems following the recipe of the semiconductor industry,” said Guido Burkard, professor of physics at the University of Konstanz, who provided guidance on theoretical aspects in collaboration with Mónica Benito, a postdoctoral researcher. “That is the vision, and this is a very important step.”
Jacob Taylor, a member of the team and a fellow at the Joint Quantum Institute, likened the light to a wire that can connect spin qubits. “If you want to make a quantum computing device using these trapped electrons, how do you send information around on the chip? You need the quantum computing equivalent of a wire.”
Silicon spin qubits are more resilient than competing qubit technologies to outside disturbances such as heat and vibrations, which disrupt inherently fragile quantum states. The simple act of reading out the results of a quantum calculation can destroy the quantum state, a phenomenon known as “quantum demolition.”
The researchers theorize that the current approach may avoid this problem because it uses light to probe the state of the quantum system. Light is already used as a messenger to bring cable and internet signals into homes via fiber optic cables, and it is also being used to connect superconducting qubit systems, but this is one of the first applications in silicon spin qubits.
In these qubits, information is represented by the electron’s spin, which can point up or down. For example, a spin pointing up could represent a 0 and a spin pointing down could represent a 1. Conventional computers, in contrast, use the electron’s charge to encode information.
Connecting silicon-based qubits so that they can talk to each other without destroying their information has been a challenge for the field. Although the Princeton-led team successfully coupled two neighboring electron spins separated by only 100 nanometers (100 billionths of a meter), as published in Science in December 2017, coupling spin to light, which would enable long-distance spin-spin coupling, has remained a challenge until now.
In the current study, the team solved the problem of long-distance communication by coupling the qubit’s information — that is, whether the spin points up or down — to a particle of light, or photon, which is trapped above the qubit in the chamber. The photon’s wave-like nature allows it to oscillate above the qubit like an undulating cloud.
Graduate student Xiao Mi and colleagues figured out how to link the information about the spin’s direction to the photon, so that the light can pick up a message, such as “spin points up,” from the qubit. “The strong coupling of a single spin to a single photon is an extraordinarily difficult task akin to a perfectly choreographed dance,” Mi said. “The interaction between the participants — spin, charge and photon — needs to be precisely engineered and protected from environmental noise, which has not been possible until now.” The team at Princeton included postdoctoral fellow Stefan Putz and graduate student David Zajac.
The advance was made possible by tapping into light’s electromagnetic wave properties. Light consists of oscillating electric and magnetic fields, and the researchers succeeded in coupling the light’s electric field to the electron’s spin state.
The researchers did so by building on team’s finding published in December 2016 in the journal Science that demonstrated coupling between a single electron charge and a single particle of light.
To coax the qubit to transmit its spin state to the photon, the researchers place the electron spin in a large magnetic field gradient such that the electron spin has a different orientation depending on which side of the quantum dot it occupies. The magnetic field gradient, combined with the charge coupling demonstrated by the group in 2016, couples the qubit’s spin direction to the photon’s electric field.
Ideally, the photon will then deliver the message to another qubit located within the chamber. Another possibility is that the photon’s message could be carried through wires to a device that reads out the message. The researchers are working on these next steps in the process.
Several steps are still needed before making a silicon-based quantum computer, Petta said. Everyday computers process billions of bits, and although qubits are more computationally powerful, most experts agree that 50 or more qubits are needed to achieve quantum supremacy, where quantum computers would start to outshine their classical counterparts.
Daniel Loss, a professor of physics at the University of Basel in Switzerland who is familiar with the work but not directly involved, said: “The work by Professor Petta and collaborators is one of the most exciting breakthroughs in the field of spin qubits in recent years. I have been following Jason’s work for many years and I’m deeply impressed by the standards he has set for the field, and once again so with this latest experiment to appear in Nature. It is a big milestone in the quest of building a truly powerful quantum computer as it opens up a pathway for cramming hundreds of millions of qubits on a square-inch chip. These are very exciting developments for the field — and beyond.”
The Latest on: Silicon quantum computing devices
Triple bend structure splits light into two highly pure polarization components
on July 16, 2018 at 5:50 am
Credit: A*STAR Institute of High Performance Computing A plan to incorporate a third bent waveguide into a silicon-based light ... as well as applications in quantum computing. The manipulation of lig... […]
Tuning into quantum: Scientists unlock signal frequency control of precision atom qubits
on July 13, 2018 at 11:06 am
... computing company - Silicon Quantum Computing Pty Ltd - was established to commercialise CQC2T's world-leading research. Based at the UNSW Sydney, the company has the target of producing a 10-qubi... […]
Scientists pump up chances for quantum computing
on July 3, 2018 at 4:18 am
The electron pump device ... quantum computing,” says project leader Dr Giuseppe C. Tettamanzi, Senior Research Fellow, at the University of Adelaide’s Institute for Photonics and Advanced Sensing. Th... […]
Why Quantum Computers Will Be Super Awesome, Someday
on June 28, 2018 at 9:00 pm
These devices were first conceived in the early 1980s ... to process so much more information so much faster than classical computers. 6. What’s the quantum version of a silicon logic gate? There’s no ... […]
Intel Starts Testing Smallest ‘Spin Qubit’ Chip for Quantum Computing
on June 11, 2018 at 8:32 am
The new chip was created in Intel’s D1D Fab in Oregon using the same silicon manufacturing techniques ... off switches that form the basis of today’s computing devices – but qubits (short for “quantum ... […]
Intel is now capable of producing full silicon wafers of quantum computing chips
on June 11, 2018 at 5:37 am
Why it matters: Mass production of quantum compute devices could fundamentally change ... the capabilities of a quantum computer need to be far greater than traditional silicon in order to make them c... […]
Silicon qubits plus light add up to new quantum computing capability
on February 13, 2018 at 4:00 pm
Credit: Emily Edwards, University of Maryland. A silicon-based quantum computing device could be closer than ever due to a new experimental device that demonstrates the potential to use light as a mes... […]
UNIST researchers develop silicon chip-based quantum photonic devices
on December 12, 2017 at 6:19 am
An international team of researchers, affiliated with UNIST has presented a core technology for quantum photonic devices used in quantum information processing. They have proposed combining of quantum ... […]
Quantum computing poised for new silicon revolution
on October 13, 2014 at 12:08 am
... quantum bits now demonstrated within a silicon electronic device, building functional quantum computers has become a much more realistic prospect. The new quantum revolution might well be built up... […]
via Google News and Bing News