Two-Qubit Engine Powered By Entanglement And Neighborhood Measurements


Researchers at Institut Néel-CNRS, University of Saint Louis, and the University of Rochester recently realized a two-qubit engine fueled by entanglement and nearby measurements. This current engine’s unique design, outlined in a paper published in Physical Review Letters, could open up exciting possibilities for thermodynamics research and advise the development of new quantum technologies.

A few years prior, Auffèves and some of her colleagues at Institut Néel-CNRS introduced the proof of concept for a measurement-fueled engine based on a single qubit. This was the first of a series of recommendations that revealed the energetic counterpart of measurement devices.

Up until now, measurement processes were normally modeled utilizing old-style theoretical approaches. In their new paper, the researchers moved forward by opening the black box of measuring devices and taking a gander at it from a quantum physical science perspective.

In their study, Auffeves and her colleagues subsequently focused on purported composite systems. Their investigation ultimately led to the design of a measurement-powered engine based on entangled qubits. Notwithstanding nearby measurements, this engine is fueled by an actual phenomenon known as quantum entanglement. Entanglement happens when a set of particles interact or remain connected with the end goal that the activities performed by one affect the other, even if there is a critical distance between them.

The new engine proposed by the researchers has two qubits. A qubit is a quantum system with two #energy states the ground state |0> and the excited state |1>,

Auffèves and her colleagues played with two qubits of different tones a red one and a blue one. The red qubit exchanges red photons, while the blue one exchanges blue photons. Strikingly, the red qubit carries less energy than the blue qubit.

The convention used by the researchers at first provides a red photon to the red qubit, preparing |1a > while the blue #qubit is |0b>. Subsequently, the qubits interact by exchanging photons with each other, becoming entangled.

The measurement-powered engine proposed by Auffèves and her colleagues relies on a composite working substance, and entanglement assumes an urgent part in its fueling mechanism. The researchers were able to do a quantitative assessment of the two actual resources brought by quantum measurement, namely data, and fuel. Also, they examined the effects of these resources on the engine’s performance.

Auffèves and her colleagues were among the first to extend measurement-powered engines to composite working substances and to offer a minute interpretation of the fueling mechanism. Their discoveries could help to extend concepts related to thermodynamics to quantum sources of noise, for example, those that can appear inside a cryostat.

In the future, the researchers’ work could inspire other teams to realize comparable engines. What’s more, their study could open up an entirely new field of research, which they suggest could be called quantum energetics.

Reference/Journal Physical Review Letters

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