On theoretical level, the thought experiment has been an object of consideration for nearly 150 years, but testing it experimentally has been impossible until the last few years. Making use of nanotechnology, scientists from Aalto University have now succeeded in constructing an autonomous Maxwell's demon that makes it possible to analyse the microscopic changes in thermodynamics. The research results were recently published inPhysical Review Letters. The work is part of the forthcoming PhD thesis of MSc Jonne Koski at Aalto University.
"The system we constructed is a single-electron transistor that is formed by a small metallic island connected to two leads by tunnel junctions made of superconducting materials. The demon connected to the system is also a single-electron transistor that monitors the movement of electrons in the system. When an electron tunnels to the island, the demon traps it with a positive charge. Conversely, when an electron leaves the island, the demon repels it with a negative charge and forces it to move uphill contrary to its potential, which lowers the temperature of the system", explained Professor Jukka Pekola.
What makes the demon autonomous or self-contained is that it performs the measurement and feedback operation without outside help. Changes in temperature are indicative of correlation between the demon and the system, or, in simple terms, of how much the demon 'knows' about the system. According to Jukka Pekola, the research would not have been possible without the Low Temperature Laboratory conditions.
"We work at extremely low temperatures, so the system is so well isolated that it is possible to register extremely small temperature changes", he stated.
"An electronic demon also enables a very large number of repetitions of the measurement and feedback operation in a very short time, whereas those who, elsewhere in the world, used molecules to construct their demons had to contend with not more than a few hundred repetitions."
The work of the team led by Jukka Pekola remains, for the time being, basic research, but in the future, the results obtained may, among other things, pave the way towards reversible computing.
"As we work with superconducting circuits, it is also possible for us to create qubits of quantum computers. Next, we would like to examine these same phenomena on the quantum level", Jukka Pekola revealed.
J.V. Koski, A. Kutvonen, I.M. Khaymovich, T. Ala-Nissilä and J.P. Pekola are the authors of the paper titled "On-chip Maxwell's demon as an information-powered refrigerator". The abstract of the article can be read at http://journals.aps.org/prl/abstract/10.1103/PhysRevLett.115.260602 .