A group of scientists from IQM Quantum Computers, Aalto University, and VTT Technical Research Centre of Finland have discovered a new superconducting qubit, the unimon, to increase the accuracy of quantum computations. The team has achieved the first quantum logic gates with unimons at 99.9 % fidelity — a major milestone on the quest to build commercially useful quantum computers. This pivotal piece of research was just published in the journal Nature Communications.
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Figure. Artistic impression of a unimon qubit in a quantum processor. Credits: Aleksandr Kakinen. (Graphic: Business Wire)
Of all the different approaches to build useful quantum computers, superconducting qubits are on the lead. However, the qubit designs and techniques currently used do not yet provide high enough performance for practical applications. In this noisy intermediate-scale quantum (NISQ) era, the complexity of the implementable quantum computations is mostly limited by errors in single- and two-qubit quantum gates. The quantum computations need to become more accurate to be useful.
“Our aim is to build quantum computers which deliver an advantage in solving real-world problems. Our announcement today is an important milestone for IQM …