A group of scientists from Aalto University, IQM Quantum Computers and VTT Technical Research Center have discovered Unimon, a new (Unimon a new superconducting qubit) efficient qubit, to speed up quantum computing. The team achieved the first logic gate with 99.9% fidelity – a big step in the quest to build a commercially viable quantum computer. The main findings have been published in the journal Nature Communications.
Among the various ways to build practical quantum computers, functional qubits come out on top. However, the qubit design currently used in the system does not provide sufficient performance for practical applications. At the time of the noise of the center-quantum quantum (NISQ), the complexity of the calculated calculation is limited by the error in the gate one and the gate quantum qubit two. Numerical calculations must be accurate to be useful.
“Our goal is to build quantum computers that provide value in solving real-world problems. Our announcement today is a milestone for IQM, and a great success for building a fully functional computer,” said Professor Mikko Möttönen, expert of Quantum Technology at Aalto University and VTT, as well as founder and chief scientist at The research was conducted by IQM Quantum Computers.
Today, Aalto, IQM and VTT introduced a new type of superconducting qubit, the unimon, which brings together in one circuit the required properties of increased anharmonicity, total insensitivity to DC load noise, reduced magnetic noise and a simple structure composition. only one Josephson junction in the resonator. The team achieved a reliability of 99.8% to 99.9% for the 13 nanosecond threshold for one qubit and three different qubits.
“Due to higher anharmonicity or lack of linearity than in transmons, we can run unimon faster, resulting in less error than one task,” Eric Hyyppä, who works in Ph.D. with IQM said.
To demonstrate the unimon experiment, scientists designed and designed chips, each containing three unimon qubits. They use niobium as a catalyst except for the Josephson junction, in which aluminum is used as the catalyst.
The team measured that the unimon qubit has limited anharmonicity as it requires only one Josephson coupling without any superintendent and noise masking. Geometric unimon inductance has the potential for higher predictability and efficiency than array coupling based on fluxonium coupling or quarton qubits.
“Unimons are simple and have many advantages over transmons. The fact that the first unimon worked well leaves a lot of room for optimization and great success. In other steps, we need to optimize the design for high noise insulation and demonstrate two qubit gates,’ added Professor Möttönen.
“We are looking to improve unimon’s structure, properties and time thresholds to break the 99.99% confidence target for useful quantum values in noisy systems and to correct quantum errors effectively. It’s an exciting day for quantum computing! » concluded Prof. Möttönen.
