The image is similar to the one used in this work. Marieke de Lorijn and DiCarlo Lab are credited.
QuTech researchers have reached a milestone in quantum error correction. They have integrated high-fidelity operations on quantum data. The findings are reported in the December issue of Nature Physics.
More words.
Errors are vulnerable to physical quantum bits. Errors arise from a variety of sources. The theory of quantum error correction allows for the possibility to compute while protecting quantum data from errors.
Prof Leonardo DiCarlo of QuTech says that there are two capabilities that will distinguish an error corrected quantum computer from a noisy intermediate-scale quantum processor. It will process quantum information in logical qubits rather than in physical qubits. Second, it will use quantum parity checks to identify and correct errors in the physical qubits, which will safeguard the information as it is being processed. The logical error rate can be suppressed if the incidence of physical errors is below a threshold and the circuits for logical operations and stabilization are fault tolerant.
The operations are all there.
The idea is that if you use more and more qubits, the net error will go down. The researchers at TNO and TU Delft have realized a major step towards this goal, realizing a logical qubit consisting of seven physical qubits. We show that we can do all the computations with the information. The integration of high-fidelity logical operations with aScalable scheme for repeated stabilization is a key step in quantum error correction.
First author and candidate for the PhD,Jorge Marques, says that researchers have been stable. We can compute as well. This is what a fault-tolerant computer will eventually do: process and protect data at the same time. We do three types of logical-qubit operations, initializing the logical qubit in any state, transforming it with gates and measuring it. We show that operations can be done directly on information. We observe higher performance for fault-tolerant variant over non-fault-tolerant variant. The build-up of physical-qubit errors can be reduced with fault-tolerant operations.
Long term.
The work is multi-disciplinary and includes experimental physics, theoretical physics, and electronics developed with TNO and external partners. IARPA and Intel Corporation are the main funders of the project.
The goal is to show that the net error rate decreases as we increase the number of bits. Our next focus will be 49 and we currently focus on 17 physical qubits. The architecture of our quantum computer was designed to allow this scaling.
J. F. Marques and his colleagues wrote about logical-qubit operations in an error-detecting surface code. There is a DOI: 10.1038/s41567-021-01423-9.
Nature physics journal information.
The research team took an important step in quantum computing with error correction.
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