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Experimental Realization of an Information Machine with Tunable Temporal Correlations.
Tamir Admon1, Saar Rahav2, Yael Roichman1
1Raymond & Beverly Sackler School of Chemistry, Tel Aviv University, Tel Aviv 6997801, Israel.
Physical Review Letters
|November 17, 2018
Summary
Scientists created a Maxwell's demon using a colloidal particle that converts measurement information into work. This system demonstrates feedback control, achieving directed motion with minimal energy input.
Area of Science:
- Physics
- Thermodynamics
- Statistical Mechanics
Background:
- Maxwell's demon is a thought experiment exploring the second law of thermodynamics.
- Information-to-work conversion is a key concept in modern physics and computation.
Purpose of the Study:
- To experimentally realize a Maxwell's demon.
- To investigate the conversion of information to work in a physical system.
- To explore the role of measurement feedback and correlations.
Main Methods:
- Utilized a colloidal particle in a fluid channel with a light-induced barrier.
- Implemented periodic position measurements of the particle.
- Applied feedback by adjusting the barrier position based on measurements.
Main Results:
- Demonstrated information-to-work conversion by steering the particle upstream with minimal direct work.
- Observed the importance of measurement correlations in the system's operation.
- Identified a tradeoff between output power and efficiency.
Conclusions:
- The experimental setup provides a clear realization of Maxwell's demon.
- The study highlights the interplay between information, work, and thermodynamics.
- Findings suggest optimal operating regimes depend on whether power or efficiency is prioritized.
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