Coherence of spin qubits has increased by 10 thousand times

Physicists from the United States and Japan increased the coherence time of solid-state spin qubits to tens of milliseconds, which is four orders of magnitude more than in the previous spin systems. Work published in the journal Science.

Quantum computers can outperform classical computational devices for many tasks, from simulations of complex biological systems to the decomposition of large numbers into Prime factors. Basic objects in a quantum computer (qubits) are microscopic and very fragile system. For example, in a solid-state realization of quantum devices as qubits are the spins. The main feature of qubits is the time of coherence, which determines how many lives the quantum state. In spin systems, the coherence time is several microseconds, which, unfortunately, is not enough to hold the large and interesting calculations.

A group of scientists from the U.S. and Japan under the leadership of Professor David Avshalom (David D. Awschalom) developed a method of preserving coherence of spin qubits to tens of milliseconds, which is 10,000 times larger than previous experiments.

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