Thursday , March 4 2021

Australian scientists managed to read a compact and precise qubit



The authors of the paper, from left to right: PhD student Mark R. Hogg; Professor Michelle Simmons; Writing by Doctor Matthew G. House; Ph.D. student Prasanna Pakkiam; Send Doctor Andrey Timofeev

The authors of the paper, from left to right: PhD student Mark R. Hogg; Professor Michelle Simmons; Writing by Doctor Matthew G. House; Ph.D. student Prasanna Pakkiam; Send Doctor Andrey Timofeev

A group led by the Australian Simmons of the year, Michelle Simmons, overcame another critical technical hurdle to create a silicon-based quantum computer.

Simmons' team at UNSW Sydney showed a compact sensor to access information stored in the electrons of each atom; this brought us one step closer to scalable quantum calculation in silicon.

The research, conducted by Prasanna Pakkiam, a student researcher and the Simmons group in Quantum Computing and Communication Technology (CQC2T) Center, was published in Physical Review X on November 27th.

Quantum bits (or qubits) made from electrons housed on single atoms in semiconductors are a promising platform for large-scale quantum computers due to their long-term stability.

READ: International scientists discuss silicon quantum computers in Australia

Precise positioning and encapsulation of individual phosphorus atoms in a silicon chip is a unique Australian approach where Simmons' team is a worldwide leader.

But the addition of all necessary connections and gates for the expansion of the phosphorus atom architecture was challenging – until now.

. To watch even a single quota, you have to build a lot of connections and doors around individual atoms, not a lot of space, Sim Simmons said.

”What's more, you need high-quality quatts to talk to each other, so you can only get it if you have an infrastructure with as few doors as possible.“

Compared with other approaches to building a quantum computer, Simmons' system already had a relatively low door density. Nevertheless, conventional measurement requires at least 4 doors for each control: 1 to check and 3 to read.

By integrating the reading sensor into one of the control gates, the team at UNSW managed to reduce it to just two doors: 1 for control and 1 for reading.

The lead author, Pakkiam, said that the system was not only more stringent, but also had the precision to determine the quantum state of quantum by measuring whether an electron is moving between two adjacent atoms, now by integrating a superconductor circuit connected to its door.

Pakkiam said, vuruş We have shown that we can do this in real time with a single measurement – a single stroke – without repeating the experiment and needing to average the results.

Simmons said this represents a major advance on how we read the embedded information in our quatts.

Ediy The result confirms that single-door quatt readings now have the required precision to perform the required quantum error correction for a scalable quantum computer, Sim Simmons said.


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