Physicists have reached a breakthrough in qubit computing

Arizona and Zhejiang State Universities make a breakthrough in qubit computing

a. Experimental SC circuit for device I with qubits and comparators in square geometry. The light gray dashed rectangles represent chain-forming dimers with in-Ja coupling, Je coupling, and small Jx cross-coupling. B. Diagram (top left) of the dynamics of collective binary states | Π〉 and | Π ′〉. Ratio enumeration Δ/ as a function of system size L for different Ja/J ratios, with Jx/2π in the range [0.3, 1.2] MHz (bottom left). 4D hypercube in Hilbert space (right). c. Quantum state tomography of four-qubit fidelity FA

Researchers from Arizona State University and Zhejiang University in China, along with two theorists from the United Kingdom, have been able to demonstrate for the first time that large numbers of quantum bits, or qubits, can be tuned to interact with each other while maintaining consistency. For an unprecedented long time, in a programmable, solid-state superconducting processor.

Previously, this was only possible in Rydberg atom systems.

In a paper to be published on Thursday, October 13, in Nature Physics Professor Ying-Cheng Lai, governor of Arizona State University, former ASU doctoral student Li Ying and experimental expert Haohua Wang, both professors at Zhejiang University in China, have shown a “first look” at the appearance of quantum multi-body scarring (QMBS). A powerful mechanism for maintaining interconnectedness between interacting qubits. Such exotic quantum states offer an attractive possibility to achieve large-scale multilateral entanglement for a variety of applications in quantum information science and technology to achieve high processing speed and Low power consumption.

“QMBS states have the intrinsic and general capacity for multipart entanglement, which makes them very attractive for applications such as quantum sensing and measurement,” Ying explained.

Classical or binary computing is based on transistors – which can only represent “1” or “0” at a time. in Quantitative Statisticsqubits can represent both 0 and 1 simultaneously, which can greatly speed up computing operations.

“in quantum information science And technology, it is often necessary to bring together a large number of basic information processing units – qubits. Quantum entanglement Among the qubits is fundamental.

“However, deterministic interactions between qubits and environmental noise can destroy coherence in a very short time — within about ten nanoseconds. This is because many interacting qubits form a multibody system,” Lai said.

The key to the research is insight into delaying the thermal conversion process to maintain consistency, which is an important research objective in quantum computing.

“From fundamental physics, we know that in a system consisting of many interacting particles, for example, molecules in a closed volume, a thermal conversion process will arise. The scramble between many qubits will stably lead to quantum heat – the process he described – called the Eigenstate hypothesis. Thermal, which will destroy Logic between the qubitLay said.

According to Lai, the findings that drive quantum computing forward will have applications in cryptography, secure communications, and cybersecurity, among other technologies.


Engineering powerful and scalable molecular qubits


more information:
Lei Ying, a multi-body Hilbert space scarring on a superconducting processor, Nature Physics (2022). DOI: 10.1038 / s41567-022-01784-9. www.nature.com/articles/s41567-022-01784-9

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the quote: Physicists Reach Qubit Computing Breakthrough (2022, Oct 13) Retrieved Oct 13, 2022 from https://phys.org/news/2022-10-physicists-qubit-breakthrough.html

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