Meet the Quantum Battery for Your Quantum Computer

You’ve heard of quantum computing, but have you heard of quantum batteries? Those qubits could be a source of power in and of themselves.
This is what physicists in Gdansk, Poland are working on.


Quantum battery could get a boost from entanglement

Physicists in Italy have designed a “quantum battery” that they say could be built using today’s solid-state technology. They claim that the device, which would store energy in the excited states of qubits, could charge up very quickly thanks to entanglement and that it could provide power for quantum computers of the future.

This research is part of a push by physicists to study the thermodynamics of very small systems, such as atomic or molecular heat engines and refrigerators. In 2012, Robert Alicki of the University of Gdansk in Poland and Mark Fannes of Leuven University in Belgium investigated how much work could be extracted reversibly from a quantum-mechanical system used to store energy temporarily. They found that by entangling many quantum batteries together they could boost the energy output per battery such that for very large numbers of them the output approached the upper limit imposed by classical thermodynamics.

Other groups have since built on that work, with one led by Kavan Modi at Monash University in Australia last year having found that collective effects can increase the charging rate of quantum batteries (even if the quantum states involved are not entangled). Now, Marco Poliniand colleagues at the Italian Institute of Technology (IIT) in Genoa have shown that these theoretical ideas could in fact be realized in practice.

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