Chalmers University researchers develop a novel quantum refrigerator that autonomously cools superconducting qubits to 22 millikelvin, significantly reducing errors and enhancing quantum computation reliability.
Researchers at Chalmers University of Technology have developed a novel quantum refrigerator that autonomously cools superconducting qubits to record-low temperatures. This breakthrough addresses a critical challenge in quantum computing : the need to maintain qubits at temperatures near absolute zero for reliable calculations. Qubits, the fundamental building blocks of quantum computers, are highly sensitive to environmental disturbances.
Even minute electromagnetic interference can cause random qubit flips, leading to errors and hindering quantum computation. To mitigate this sensitivity, qubits are typically fabricated from superconducting circuits and cooled using dilution refrigerators, which can achieve temperatures around 50 millikelvin above absolute zero. However, the new quantum refrigerator developed by Chalmers researchers can cool qubits to 22 millikelvin without external control. This significantly lower temperature reduces qubit susceptibility to errors, resulting in more reliable and enduring quantum computations. The refrigerator operates by harnessing interactions between multiple qubits. It employs a three-qubit system: one target qubit to be cooled and two other qubits acting as the cooling mechanism. One cooling qubit is coupled to a warm environment (hot bath), while the other is coupled to a cold environment (cold bath). Energy from the hot bath is used to pump heat from the target qubit into the cold qubit, which is then thermalized to the cold environment. This autonomous system, powered by the natural heat arising from the temperature difference between the two thermal baths, offers a promising path towards advancing quantum computing. This technology has the potential to accelerate progress in various fields, including medicine, energy, encryption, AI, and logistics
Quantum Computing Qubits Superconducting Circuits Quantum Refrigerator Error Correction
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