The Quest for an Ideal Quantum Bit

By Joseph E. Harmon

May 5, 2022

Editor’s Note: As shown in this article written by Joseph E. Harmon and reposted from Argonne National Laboratory, the hunt for better qubits is hardly over. What began as small circle of promising qubits technologies dominated by superconducting semiconductor-based qubits (think IBM and Google) and joined fast by trapped ions (IonQ, Quantinuum) and recently by photonics (PsiQuantum, Xanadu) is expanding. No doubt, there are pleasant surprises ahead before we settle on a dominant set of qubit technologies.  

You are no doubt viewing this article on a digital device whose basic unit of information is the bit, either 0 or 1.  Scientists worldwide are racing to develop a new kind of computer based on use of quantum bits, or qubits.

In a recent Nature paper, a team led by the U.S. Department of Energy’s (DOE) Argonne National Laboratory has announced the creation of a new qubit platform formed by freezing neon gas into a solid at very low temperatures, spraying electrons from a light bulb’s filament onto the solid, and trapping a single electron there. This system shows great promise to be developed into ideal building blocks for future quantum computers.

A qubit is special because it can simultaneously be 0 and 1. Physicists sometimes compare this state to a famous quantum thought experiment in which a cat hidden in a box is theoretically alive and dead at the same time before someone opens the box and looks inside. When there are many qubits, such overlapping states give quantum computers tremendously increased horsepower. They thus could one day solve complex problems beyond any classical supercomputers.

To realize a useful quantum computer, the quality requirements for the qubits are extremely demanding. While there are various forms of qubits today, none of them is ideal.

What would make an ideal qubit? It has at least three sterling qualities, according to Dafei Jin, an Argonne scientist and the principal investigator of the project.

A new qubit platform: Electrons from a heated light filament (top) land on solid neon (red block), where a single electron (represented as a wave function in blue) is trapped and manipulated by a superconducting quantum circuit (bottom patterned chip). (Image by Dafei Jin/Argonne National Laboratory.)

It can remain in a simultaneous 0 and 1 state (remember the cat!) over a long time. Scientists call this long ​“coherence.” Ideally, that time would be around a second, a time step that we can perceive on a home clock in our daily life.

Second, the qubit can be changed from one state to another in a short time. Ideally, that time would be around a billionth of a second (nanosecond), a time step of a classical computer clock.

Third, the qubit can be easily linked with many other qubits so they can work in parallel with each other. Scientists refer to this linking as entanglement.

Although at present the well-known qubits are not ideal, companies like IBM, Intel, Google, Honeywell and many startups have picked their favorite. They are aggressively pursuing technological improvement and commercialization.

 ​“Our ambitious goal is not to compete with those companies, but to discover and construct a fundamentally new qubit system that could lead to an ideal platform,” said Jin.

While there are many choices of qubit types, the team chose the simplest one — a single electron. Heating up a simple light filament you might find in a child’s toy can easily shoot out a boundless supply of electrons.

One of the challenges for any qubit, including the electron, is that it is very sensitive to disturbance from its surroundings. Thus, the team chose to trap an electron on an ultrapure solid neon surface in a vacuum.

Neon is one of a handful of inert elements that do not react with other elements. ​“Because of this inertness, solid neon can serve as the cleanest possible solid in a vacuum to host and protect any qubits from being disrupted,” said Jin.

A key component in the team’s qubit platform is a chip-scale microwave resonator made out of a superconductor. (The much larger home microwave oven is also a microwave resonator.) Superconductors — metals with no electrical resistance — allow electrons and photons to interact together at near to absolute zero with minimal loss of energy or information.

“The microwave resonator crucially provides a way to read out the state of the qubit,” said Kater Murch, physics professor at the Washington University in St. Louis and a senior co-author of the paper. ​“It concentrates the interaction between the qubit and microwave signal. This allows us to make measurements telling how well the qubit works.”

“With this platform, we achieved, for the first time ever, strong coupling between a single electron in a near-vacuum environment and a single microwave photon in the resonator,” said Xianjing Zhou, a postdoctoral appointee at Argonne and the first author of the paper. ​“This opens up the possibility to use microwave photons to control each electron qubit and link many of them in a quantum processor,” Zhou added.

Source: Argonne National Laboratory

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