RECENT ARTICLES

Philosophers, physicists and neuroscientists discuss how our sense of time’s flow might arise through our interactions with external stimuli—despite suggestions from Einstein's relativity that our perception of the passage of time is an illusion.

A devilish new framework of thermodynamics that focuses on how we observe information could help illuminate our understanding of probability and rewrite quantum theory.

An unusual approach to unifying the laws of physics could solve Hawking's black-hole information paradox—and its predicted gravitational "memory effect" could be picked up by LIGO.

Objective reality, and the laws of physics themselves, emerge from our observations, according to a new framework that turns what we think of as fundamental on its head.

The impossibility of building a perfect clock could help explain away microscale weirdness.

FQXI ARTICLE

June 27, 2019

Natural Selection in Action

November 10, 2009

COULD QUANTUM DOTS PROVE QUANTUM DARWINISM

Credit: Lin-Wang Wang, Lawrence Berkeley National Laboratory

In 2007, Wojciech Zurek of the Los Alamos National Laboratory in New Mexico, and his former student, Robin Blume-Kohout of the California Institute of Technology in Pasadena, developed a computer model in which a "quantum pendulum" was set oscillating according to the laws of quantum mechanics. Such an oscillator can exist in a superposition of states, simultaneously present in all possible locations along its path. The duo modeled the environment by including thousands of other pendulums nearby, each "swinging" at a different frequency.

If quantum Darwinism is correct, the environmental pendulums should record a copy of the quantum pendulum’s position. And that is what it did. Multiple copies of the same quantum state were replicated throughout the environment. The model showed quantum Darwinism in action.

In addition, early this year, Roland Brunner of the University of Leoben in Austria and his colleagues showed quantum Darwinism, in theory, in an array of quantum dots—nanoscale bits of semiconducting materials, with electrons that can exist in a superposition of states.

The team studied what happens when multiple dots are arrayed in series and also interact with the environment. They found that two adjacent quantum dots gave rise to a special quantum state that was peculiar to their interaction, and not merely a combination of states of individual quantum dots.

More importantly, they showed that they could find out about these special states by looking at individual quantum dots. It’s as if stable states had been copied and imprinted on all the individual dots. All observers would see the same objective reality—thanks to quantum Darwinism.

Return to the main article.

Comment on this Article

Please read the important Introduction that governs your participation in this community. Inappropriate language will not be tolerated and posts containing such language will be deleted. Otherwise, this is a free speech Forum and all are welcome!

function ValidatePostText_main () {
form = document.addPostForm_main;
var recaptcha = $("#g-recaptcha-response").val();
if (recaptcha === "") {
event.preventDefault();
alert("The reCaptcha Box below must be checked before you submit the form");
}
else if (form.postText_main.value == '') {
alert ("The post contains no text");
return false;
}
else {
return true;
}
}

**Your name:**
(optional)

Please read the important Introduction that governs your participation in this community. Inappropriate language will not be tolerated and posts containing such language will be deleted. Otherwise, this is a free speech Forum and all are welcome!

Please enter the text of your post, then click the "Submit New Post" button below. You may also optionally add file attachments below before submitting your edits.

HTML tags are not permitted in posts, and will automatically be stripped out. Links to other web sites are permitted. For instructions on how to add links, please read the link help page.

You may use superscript (10

^{100}) and subscript (A_{2}) using [sup]...[/sup] and [sub]...[/sub] tags.You may use bold (

**important**) and italics (*emphasize*) using [b]...[/b] and [i]...[/i] tags.You may also include LateX equations into your post.

Insert LaTeX Equation
[hide]

LaTeX equations may be displayed in FQXi Forum posts by including them within [equation]...[/equation] tags. You may type your equation directly into your post, or use the LaTeX Equation Preview feature below to see how your equation will render (this is recommended).

For more help on LaTeX, please see the LaTeX Project Home Page.

LaTeX Equation Preview

preview equation

clear equation

insert equation into post at cursor

LaTeX equations may be displayed in FQXi Forum posts by including them within [equation]...[/equation] tags. You may type your equation directly into your post, or use the LaTeX Equation Preview feature below to see how your equation will render (this is recommended).

For more help on LaTeX, please see the LaTeX Project Home Page.

LaTeX Equation Preview

preview equation

clear equation

insert equation into post at cursor

Attachments
[hide]

You may optionally attach up to two documents to your post. To add an attachment, use the following feature to browse your computer and select the file to attach. The maximum file size for attachments is 1MB.

Once you're done adding file attachments, click the "Submit New Post" button to add your post.

You may optionally attach up to two documents to your post. To add an attachment, use the following feature to browse your computer and select the file to attach. The maximum file size for attachments is 1MB.

Once you're done adding file attachments, click the "Submit New Post" button to add your post.