Fujitsu and TU Delft have collaborated to build a diamond-based quantum chip with record low error rates of 0.1 percent.
A quantum gate set designed using diamond spin qubits has set a global record by achieving an error probability rate below 0.1 percent. The feat was achieved through collaboration between researchers at the Japanese company Fujitsu and QuTech and the quantum computing technology development at TU Delft in the Netherlands.
Quantum computers are touted as the next frontier of computing, capable of completing computations in minutes, which even today’s fastest supercomputers would take decades to complete. Quantum computers leverage quantum states of materials to process a large sequence of basic operations, also known as quantum gates. The precision of the quantum gate determines the precision of the computations performed on the quantum computer. So, researchers focus on further reducing the error rates of quantum gates so that downstream error correction can work more efficiently and pave the way for a future with quantum computing. Researchers at Fujitsu and QuTech achieved a global first error rate of below 0.1 percent using a quantum gate system made with diamond spin qubits. What are diamond spin qubits? Spins in diamonds can be used to store quantum data or qubits. Inside a diamond crystal are two types of spins – electron and nuclear- formed by the specific defects of their color centers. These can hold quantum states for prolonged periods, making them good candidates for high-performance qubits. Unlike superconducting qubits that operate near absolute zero, diamond spin qubits can operate at 100x higher temperatures of up to 10 Kelvin. These qubits can link easily to photons – particles of light, to transmit quantum states while protecting them from environmental noise, making them ideal candidates for quantum networks. The researchers collaborated with Element Six, a synthetic diamonds company, to create diamonds with low carbon-13 isotope concentration and created a two-qubit system, one formed by the electron spin and the other by the diamond’s nuclear spin. Record low error rates for quantum computerEach type of gate in this two-qubit system had an error rate below 0.1 percent, with some reaching even 0.001 percent error rates. High-precision quantum gate operation in the diamond spin approach. Image credit: Fujitsu“To realize such highly precise gates we had to systematically remove sources of errors,” said Hans Bartling, a researcher at QuTech, in a press release. “The first step was to use ultrapure diamonds that have a lower concentration of carbon-13 isotopes as these cause noise. The second key step was to design gates that carefully decouple the spin qubits from each other and from interactions with the remaining noise in the environment.”To characterize the gates, the research team used a method called ‘gate set tomopgraphy’ that provided detailed information about gate errors and pulse strength, which was then used to optimize them. The research team then tested the gates using an artificial algorithm with a large sequence of gates. After 800 operations, the quantum system was deemed precise and well-understood. In the future, the researchers plan to work on increasing the number of nuclear spins in the system and developing optical interconnects to increase the number of manageable qubits. The research findings were published in the journal Physical Review Applied.
Error Correction Error Rates Fujitsu Inventions And Machines Quantum Algorithm Quantum Computer Quantum Computing Quantum Gates Qubits TU Delft
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Amazon joins the quantum computing race with a chip designed for error correctionAnna has been a freelance writer for more than a decade. In that time, she's covered everything from electronics to esports, from marketing to magic. Her tech and entertainment reporting has appeared on Ars Technica, Mashable, Digital Trends, and more. She especially loves playing, making, and geeking out over video games.
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