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FQXI ARTICLE

April 18, 2014

De-Spooking Quantum Mechanics

Einstein wouldn’t have found entanglement so strange, if he’d thrown out a key pre-twentieth-century misconception.

FQXi Awardees: Wayne Myrvold

July 13, 2011

WAYNE MYRVOLD

University of Western Ontario

He’s not.

In fact, Myrvold is a philosopher of science and he has no idea how to play the concertina. But rather than take conventional music lessons, he enjoys the challenge of trying to figure out the instrument in his own way. Myrvold takes a similar approach to understanding quantum mechanics: He knows the standard answers from physicists, but he hopes that his own philosophical take will illuminate some of the theory’s famous peculiarities and will show that its spooky reputation is unwarranted.

"If someone tells me that quantum mechanics is weird, counterintuitive and strange, but you should just accept that we live in a strange counterintuitive quantum world, I’ll say okay but tell me what kind of world that is," Myrvold says.

In the weird quantum realm, subatomic particles can be in two places at once, or exist in multiple energy states, before anyone looks at them. The standard explanation is that before you observe it, a quantum object is described mathematically by a smeared out

That’s the textbook answer. But, says Myrvold, even if you can wrap your head around wavefunction collapse, another quantum phenomenon—entanglement—makes everything problematic. Entangled particles are intertwined in such a way that measuring the properties of one seems to instantaneously affect the properties of its partners. Einstein famously denounced entanglement as "spooky action at a distance" because this communication appears to happen faster than the speed of light—violating the universe’s speed limit, set by his theory of relativity. This feature of quantum mechanics is called non-locality.

"To comply with relativity, you don’t want the possibility for faster than light signaling," explains FQXi-member Daniel Bedingham, a physicist who has also wrestled with wavefunction collapse, independently from Myrvold, at Imperial College London, UK.

Collapsing Misconceptions

Myrvold, however, believes that any seeming violation of relativity is an illusion. He argues that if we throw out one of our pre-20

UNTANGLING ENTANGLEMENT

Could a new philosophy shed light on photon experiments?

Credit: IQOQI, University of Vienna

If you can free yourself from assuming separability, Myrvold argues, then when you observe one part of an entangled system, you will not be fooled into thinking of it as a separate object and become sidetracked worrying about how it can influence other separate objects. Myrvold believes that this misunderstanding leads us to falsely associate a single reference point in time with that part of the system, skewing our perception of what can happen to the rest of the system and when.

With an FQXi grant of over $56,000, Myrvold will be working out just how to weave non-separability into quantum mechanics explicitly, so that its not longer perceived as a strange and mysterious byproduct of the theory, but as a central—normal—feature. In addition to preparing a series of papers, he plans to work with other experts, both in philosophy and physics, at various workshops.

If you take quantum mechanics

seriously, it’s separability that

you have to give up.

seriously, it’s separability that

you have to give up.

- Wayne Myrvold

"If you believe that those correlations are correctly predicted by quantum mechanics then you are stuck with non-locality," says Maudlin. "The deal is not about how do I get around it, but how do I deal with it and work it into my physics in a clearer way."

Bedingham, who last year won FQXi’s Most Courageous Postdoc prize, has his own strategy for bringing quantum mechanics into line with relativity. In this model, the two entangled particles are on two unique, but interacting, hyperspaces. When one particle is observed, its wavefunction collapses sending out a ripple in that hyperspace. The second particle’s properties change when that ripple effect is felt on the adjacent hyperspace. (Read our Q&A with Daniel Bedingham for more details.)

At present, it is difficult to think of a test that could discriminate between theories of wavefunction collapse. Myrvold notes that arguments about these issues date back to the birth of quantum mechanics, with little resolution. "It might look like people are just going around in circles and getting nowhere," he admits. "But even if we haven’t reached consensus, we have a much better appreciation for what the viable options are and how to think about them."

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RODNEY BARTLETT wrote on July 12, 2013

I left out a couple of lines in the middle of the last paragraph of my post. It should read -

"... anticlockwise flow in a second 2D Mobius. These combine 1) via the infinitely long transcendental and irrational numbers, and 2) via bosons being ultimately composed of 1’s and 0’s depicting pi, e, √2 etc.; and fermions being given mass by bosons interacting in matter particles’ “wave packets”. They form a four-dimensional Klein bottle which is in fact one of the...

I left out a couple of lines in the middle of the last paragraph of my post. It should read -

"... anticlockwise flow in a second 2D Mobius. These combine 1) via the infinitely long transcendental and irrational numbers, and 2) via bosons being ultimately composed of 1’s and 0’s depicting pi, e, √2 etc.; and fermions being given mass by bosons interacting in matter particles’ “wave packets”. They form a four-dimensional Klein bottle which is in fact one of the...

RODNEY BARTLETT wrote on July 12, 2013

The first part of this comment concerns the equation "H(subscript u) = (BEc)(superscript e infinity), or 1 = 1(superscript infinity)" - this equation looks like the one physicists are hoping will be printed on T-shirts in the middle of this century as a description of the Universe.

H is for the Hamiltonian, representing the total energy of a quantum mechanical system. The subscript u stands for “universe” and Hu means the universe operates quantum mechanically (quantum effects...

The first part of this comment concerns the equation "H(subscript u) = (BEc)(superscript e infinity), or 1 = 1(superscript infinity)" - this equation looks like the one physicists are hoping will be printed on T-shirts in the middle of this century as a description of the Universe.

H is for the Hamiltonian, representing the total energy of a quantum mechanical system. The subscript u stands for “universe” and Hu means the universe operates quantum mechanically (quantum effects...

ERIC STANLEY REITER wrote on August 5, 2012

I have documented the experiment you requested to discriminate theories of wave function collapse. The experiments demonstrate failure of the probabilistic collapse of the wave function. Starting with singly emitted gamma-rays in a beam-split coincidence test, the gamma detection should occur at one detector or the other, but not both, according to Quantum Mechanics. My coincidence rates greatly exceed chance, contradict QM, and answer many questions. Also, I performed a similar beam...

I have documented the experiment you requested to discriminate theories of wave function collapse. The experiments demonstrate failure of the probabilistic collapse of the wave function. Starting with singly emitted gamma-rays in a beam-split coincidence test, the gamma detection should occur at one detector or the other, but not both, according to Quantum Mechanics. My coincidence rates greatly exceed chance, contradict QM, and answer many questions. Also, I performed a similar beam...

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