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Researchers aim to correct quantum errors at super-cold temperatures instead of room temperature

Mistakes happen, and even more so in the quantum world. But monitoring those tiny quantum errors is now very slow, inefficient, and expensive.

‘Currently, these errors are read from a quantum processor by bringing the information through cables from -273 degrees Celsius to room temperature for processing by a normal computer,’ says .

When the conventional computer figures out what kind of error it is, the control pulse travels back along similar cables.

Möttönen has proposed a novel solution for quantum error correction and has received a grant from the Jane and Aatos Erkko Foundation to develop it. The initial aim is to build separate components, and to get at least two such separate devices to work together with the qubit at low temperatures.

‘In the longer term, the idea is to build an autonomous quantum processor.’

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New method of measuring qubits promises ease of scalability in a microscopic package

Aalto University researchers are the first in the world to measure qubits with ultrasensitive thermal detectors—thus evading the Heisenberg uncertainty principle

Chasing ever-higher qubit counts in near-term quantum computers constantly demands new feats of engineering.

Among the troublesome hurdles of this scaling-up race is refining how qubits are measured. Devices called parametric amplifiers are traditionally used to do these measurements. But as the name suggests, the device amplifies weak signals picked up from the qubits to conduct the readout, which causes unwanted noise and can lead to decoherence of the qubits if not protected by additional large components. More importantly, the bulky size of the amplification chain becomes technically challenging to work around as qubit counts increase in size-limited refrigerators.

Cue the Aalto University research group Quantum Computing and Devices (QCD). They have a hefty track record of showing how thermal bolometers can be used as ultrasensitive detectors, and they just demonstrated in an April 10 Nature Electronics paper that bolometer measurements can be accurate enough for single-shot qubit readout.

(2024)

Media coverage in English:  Aalto University 

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Quantum discovery offers glimpse into other-worldly realm

Experiments promote a curious flipside of decaying monopoles: a reality where particle physics is quite literally turned on its head

Dubbed the ‘Alice ring’ after Lewis Carroll’s world-renowned stories on Alice’s Adventures in Wonderland, the appearance of this object verifies a decades-old theory on how monopoles decay. Specifically, that they decay into a ring-like vortex, where any other monopoles passing through its centre are flipped into their opposite magnetic charges.

14, 5100 (2023)

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QCD's new paper as a result from an amazing collaboration with Bluefors!

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Unimon - A new qubit to boost quantum computers for useful applications

A group of scientists from Aalto University, IQM Quantum Computers, and VTT Technical Research Centre of Finland have discovered a new superconducting qubit, the unimon, to increase the accuracy of quantum computations

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A peculiar protected structure links Viking knots with quantum vortices

Mathematical analysis identifies a vortex structure that is impervious to decay

Scientists have shown how three vortices can be linked in a way that prevents them from being dismantled. The structure of the links resembles a pattern used by Vikings and other ancient cultures, although this study focused on vortices in a special form of matter known as a Bose-Einstein condensate. The findings have implications for quantum computing, particle physics and other fields.

, 5, 2022

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Mikko Möttönen and his team aim to rein in qubit errors. The research project recently received €2.5 million from the EU to develop a more accurate type of a qubit.

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A new super-cooled microwave source boosts the scale-up of quantum computers

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Bolometer operating at the threshold for circuit quantum electrodynamics

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Qubit Measurement by Multichannel Driving

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