Related Experiment Video
Updated: Aug 24, 2025
05:39
Scalable Quantum Integrated Circuits on Superconducting Two-Dimensional Electron Gas Platform
Published on: August 2, 2019
9.7K
Asynchronism and nonequilibrium phase transitions in (1+1)-dimensional quantum cellular automata
Edward Gillman1,2, Federico Carollo3, Igor Lesanovsky1,2,3
1School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom.
Physical Review. E
|October 21, 2022
Summary
Researchers introduce a method to extend quantum cellular automata into quantum nonequilibrium models by incorporating asynchronism. This reveals an "asynchronism transition" impacting phase transitions, linking to quantum contact process observations.
Area of Science:
- Quantum physics
- Complex systems
- Computational science
Background:
- Probabilistic cellular automata model classical nonequilibrium processes.
- Quantum cellular automata (QCA) utilize quantum gates for state propagation, forming (1+1)-dimensional structures.
- These QCA are special cases of recurrent quantum neural networks.
Purpose of the Study:
- To present a general method for extending QCA into genuinely quantum nonequilibrium models.
- To systematically include asynchronism in quantum automaton models.
- To investigate the impact of asynchronism on phase transitions.
Main Methods:
- Developed a general prescription for incorporating asynchronism into QCA models.
- Applied the method to the classical contact process, creating a model linked to the quantum contact process (QCP).
- Studied the mean-field behavior of the resulting quantum nonequilibrium model.
Main Results:
- Demonstrated the extension of QCA into quantum nonequilibrium models via asynchronism.
- Observed evidence of an "asynchronism transition" in the mean-field behavior.
- Linked this transition to phenomena observed in the quantum contact process (QCP).
Conclusions:
- Asynchronism is a key factor in developing quantum nonequilibrium models.
- The "asynchronism transition" signifies a qualitative change in phase transition behavior.
- The findings provide insights into the quantum contact process and open quantum systems.
Related Concept Videos
01:16Non-equilibrium in the Cell
4.7K
An important concept in studying metabolism and energy is that of chemical equilibrium. Most chemical reactions are reversible. They can proceed in both directions, releasing energy into their environment in one direction, and absorbing it from the environment in the other direction. The same is true for the chemical reactions involved in cell metabolism, such as the breaking down and building up of proteins into and from individual amino acids, respectively. Reactants within a closed system...
4.7K
01:10First Law: Particles in One-dimensional Equilibrium
7.0K
Newton's first law of motion states that a body at rest remains at rest, or if in motion, remains in motion at constant velocity, unless acted on by a net external force. It also states that there must be a cause for any change in velocity (a change in either magnitude or direction) to occur. This cause is a net external force. For example, consider what happens to an object sliding along a rough horizontal surface. The object quickly grinds to a halt, due to the net force of friction. If...
7.0K
02:31Phase Transitions
19.6K
Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to...
19.6K
01:58Cooperative Allosteric Transitions
2.3K
2.3K
01:10Entropy Change in Reversible Processes
2.7K
In the Carnot engine, which achieves the maximum efficiency between two reservoirs of fixed temperatures, the total change in entropy is zero. The observation can be generalized by considering any reversible cyclic process consisting of many Carnot cycles. Thus, it can be stated that the total entropy change of any ideal reversible cycle is zero.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
The statement can be further generalized to prove that entropy is a state function. Take a cyclic process between any two points on a p-V diagram.
2.7K
01:18First Law: Particles in Two-dimensional Equilibrium
5.2K
Recall that a particle in equilibrium is one for which the external forces are balanced. Static equilibrium involves objects at rest, and dynamic equilibrium involves objects in motion without acceleration; but it is important to remember that these conditions are relative. For instance, an object may be at rest when viewed from one frame of reference, but that same object would appear to be in motion when viewed by someone moving at a constant velocity.
Newton's first law tells us about...
Newton's first law tells us about...
5.2K