scholarly journals Experimental demonstration of coherent superpositions in an ultrasonic pseudospin

2019 ◽  
Vol 9 (1) ◽  
Author(s):  
Lazaro Calderin ◽  
M. Arif Hasan ◽  
Neil G. Jenkins ◽  
Trevor Lata ◽  
Pierre Lucas ◽  
...  
Keyword(s):  
Wave Function ◽  
Steel Plates ◽  
Hertzian Contact ◽  
Experimental Demonstration ◽  
Experimental Realization ◽  
Wave Function Collapse ◽  
Coherent Superposition ◽  
Classical Waves ◽  
Restoring Forces ◽  
And Control

Abstract We experimentally demonstrate the existence and control of coherent superpositions of elastic states in the direction of propagation of an ultrasonic pseudospin i.e., a φ-bit. The experimental realization of this mechanical pseudospin consists of an elastic aluminum rod serving as a waveguide sandwiched between two heavy steel plates. The Hertzian contact between the rod and the plates leads to restoring forces which couple the directions of propagation (forward and backward). This coupling generates the coherence of the superposition of elastic states. We also demonstrate φ-bit gate operations on the coherent superposition analogous to those used in quantum computing. In the case of a φ-bit, the coherent superposition of states in the direction of propagation are immune to wave function collapse upon measurement as they result from classical waves.

A model of quantum-von Neumann hybrid cellular automata: principles and simulation of quantum coherent superposition and dehoerence in cytoskeletal microtubules

2015 ◽  
Vol 15 (1&2) ◽  
pp. 22-36
Author(s):  
Manuel Alfonseca ◽  
Alfonso Ortega ◽  
Marina de la Cruz ◽  
Stuart R. Hameroff ◽  
Rafael Lahoz-Beltra
Keyword(s):  
Wave Function ◽  
Cellular Automata ◽  
Biological Function ◽  
Stable State ◽  
Microscopic Level ◽  
Quantum Biology ◽  
Wave Function Collapse ◽  
Von Neumann ◽  
Hybrid Cellular Automata ◽  
Coherent Superposition

Although experimental evidence suggests the influence of quantum effects in living organisms, one of the most critical problems in quantum biology is the explanation of how those effects that take place in a microscopic level can manifest in the macroscopic world of living beings. At present, quantum decoherence associated with the wave function collapse is one of the most accepted mechanisms explaining how the classical world of living beings emerges from the quantum world. Whatever the cause of wave function collapse, there exist biological systems where a biological function arises as a result of this collapse (e.g. birds navigation, plants photosynthesis, sense of smell, etc.), as well as the opposite examples (e.g. release of energy from ATP molecules at actomyosin muscle) where a biological function takes place in a quantum coherent environment. In this paper we report the modelling and simulation of quantum coherent superposition in cytoskeletal microtubules including decoherence, thus the effect of the collapse of the microtubule coherent state wave function. Our model is based on a new class of hybrid cellular automata (QvN), capable of performing as either a quantum cellular automata (QCA) or as a classical von Neumann automata (CA). These automata are able to simulate the transition or reduction from a quantum microscopic level with superposition of several quantum states, to a macroscopic level with a single stable state. Our results illustrate the significance of quantum biology explaining the emergence of some biological functions. We believe that in the future quantum biology will have a deep effect on the design of new devices, e.g. quantum hardware, in electrical engineering.

scholarly journals Detecting wave function collapse without prior knowledge

2015 ◽  
Vol 56 (8) ◽  
pp. 082103
Author(s):  
Charles Wesley Cowan ◽  
Roderich Tumulka
Keyword(s):  
Wave Function ◽  
Prior Knowledge ◽  
Wave Function Collapse

scholarly journals Does particle decay cause wave function collapse: an experimental test

2003 ◽  
Vol 308 (5-6) ◽  
pp. 323-328 ◽  
Author(s):  
Spencer R. Klein ◽  
Joakim Nystrand
Keyword(s):  
Wave Function ◽  
Experimental Test ◽  
Wave Function Collapse ◽  
Particle Decay

scholarly journals If the propagator of QED were reversed, the mathematics of Nature would be much simpler

2020 ◽  
Vol 18 ◽  
pp. 129-153
Author(s):  
Jeffrey Boyd
Keyword(s):  
Wave Function ◽  
Path Integral ◽  
Quantum Electrodynamics ◽  
Probability Amplitude ◽  
Integral Approach ◽  
Everyday Experience ◽  
Wave Function Collapse ◽  
Path Integral Approach ◽  
Classical World ◽  
The Many

In Quantum ElectroDynamics (QED) the propagator is a function that describes the probability amplitude of a particle going from point A to B. It summarizes the many paths of Feynman’s path integral approach. We propose a reverse propagator (R-propagator) that, prior to the particle’s emission, summarizes every possible path from B to A. Wave function collapse occurs at point A when the particle randomly chooses one and only one of many incident paths to follow backwards with a probability of one, so it inevitably strikes detector B. The propagator and R-propagator both calculate the same probability amplitude. The R-propagator has an advantage over the propagator because it solves a contradiction inside QED, namely QED says a particle must take EVERY path from A to B. With our model the particle only takes one path. The R-propagator had already taken every path into account. We propose that this tiny, infinitesimal change from propagator to R-propagator would vastly simplify the mathematics of Nature. Many experiments that currently describe the quantum world as weird, change their meaning and no longer say that. The quantum world looks and acts like the classical world of everyday experience.

Sign in / Sign up

Export Citation Format

Share Document