I knew I was onto something good when I came across the Quantum Zeno Effect (QZE).
It’s a bit of a strange concept that, on the surface, seems nothing more than another intricately and frustratingly cute attempt to make us understand the illusory nature of time and of the peculiarity underscoring anything relating to quantum mechanics.
But below the surface, there are some tremendously intriguing consequences to consider with respect to consciousness (or conscious measurement), probability, and the increasingly curious relationship between mind and matter.
Zeno of Elea (born 495 BCE) had been a thinker like few before and after him. Undoubtedly one of the most underappreciated philosophers of our recorded history, Zeno’s work has been effectively plagiarized by the likes of Isaac Newton and Albert Einstein — okay, not really, but his paradoxes have lived on through time (ironically) as a testament to the fact that time itself (as well as motion through time) is truly an illusion.
QZE, simply put, details the idea that the evolution of a quantum system can be slowed due to repeated measurements; similarly, other quantum theorists will and do apply this concept to the collapse of wave functions. It emanates from one of nine surviving paradoxes of Zeno of Elea which, together, sought to break down our understanding of time by revealing how illusory our motion through it really is.
But, more than anything, QZE epitomizes the endless dance between mind and matter — between consciousness and the physical world around it. Sadly, it harshly reiterates the fact that we humans are exceptionally limited in our perception and understanding of the world around us.
And so I was more than happy to have the chance to pick the mind of someone who is well steeped in this discussion —physicist and author of Decoherence and the Appearance of a Classical World in Quantum Theory, Erich Joos.
The brief Q&A (presented below) served to affirm two points for myself: a) I’m in way over my head trying to discuss intricate concepts with physicists and b) we can’t really know what any of it means — which, I’ll happily admit, is somewhat of a relief under the shadow of the first point.
Here’s the truth of the matter — as I see it: We’re not supposed to be able to zoom in close enough to see the odd happenings of quantum mechanics, but technology has superseded our abilities of observing the natural universe around us; consequently, it has led us to witness some of the most counter-intuitive and nonsensical occurrences that, try as we might, we can’t explain.
And so what do we do? We guess. Mystics and spiritualists will try to squeeze such ‘spooky happenings at a distance’ into their interface of reality to signify that consciousness can influence matter or possibility; that we can entangle ourselves mentally or quantum tunnel through life’s obstacles to achieve unrestrained success. Similarly, technologists will use these findings for whatever digitized purpose they see fit (quantum computing, for instance, or highlighting simulation theory); astrophysicists will possibly see these happenings as cosmically fractal in nature when overlaid upon the macro-celestial world and physicists, like Erich, will simply see more questions than answers.
We know one thing from quantum science — the observer effect is real and, in the realm of this discussion, it’s no less of a substantial element in the overall equation. This means something, we just don’t know what it means.
In fact, the one thing that remains comically consistent is the fact that a true understanding of time itself remains so outrageously elusive. Time remains the enigmatic force that will maybe never show its face, causing us to wrestle with both its subjective and objective natures or taunting us to try and outsmart it by liberating ourselves from its perceptive clutches.
Well, this is where Zeno’s parables come in to say that, even after 2500 years, even with all the technology and mathematics and instruments of science, with our novel and modern understandings into spacetime or gravity or dark matter or quantum physics — we can’t.
While it makes for a good kick in the pants of every generation throughout our evolution, it’s something that Plato, Immanuel Kant, Bertrand Russel and countless others since have come to acknowledge: we humans are tremendously limited in our ability to understand the nature of our reality — especially through sensory experience.
The QZE is a can of worms that I had been happy to open for the sole fact that it reiterated to me the limits of our understanding. Maybe the mystics are right, or maybe this all means nothing. Consciousness, time, matter — we should never get comfortable enough to think that we can even begin to understand how these all work and, especially, how they interact.
Sometimes, we just have to acknowledge that we can’t know everything.
Q. Does the quantum Zeno effect convince you, yourself, that time (and our motion through time) is really illusory? As the philosopher Zeno sought to do with his paradoxes, are you convinced that our limited perception of time is inherently unable to understand time’s true nature? Or does this all mean something different to you under the umbrella of decoherence?
E.J.: Understanding the “nature of time” is an endless journey, where everyone starts from a different shore. In order not to be lost, I prefer to concentrate on a few aspects from a physicist’s perspective.
The “quantum Zeno effect” is a special physical situation where a “system” is “observed” very “intensively”. From a physical point of view, this means there is a strong interaction between the considered system which another one, which is usually called “measurement device”, but could be anything which interacts in a certain way. Then, from the very structure of evolution (in time!) in quantum theory (formalized by the Schrödinger equation), it follows that the normal evolution of the system may be slowed down and completely stopped in the limiting case of “indefinitely strong observation”. Of course such a limit cannot be achieved in the real world and is only a mathematical idealization. In a sense, the quantum Zeno effect is the limit of strong decoherence.
Not all objects are sensitive to the quantum Zeno effect. Of course — after all we see an evolving world around us. Staring a my pencil as it drops from my table will not stop it from doing so. It turns out, that in particular what we call “macroscopic objects” escape this effect, while typical “quantum systems” (nowadays called qbits) are very sensitive.
So from a physical standpoint there is nothing mystical about the quantum Zeno effect.
In this framework, time is still an external parameter (the Newtonian sense). If one wants to deal with time itself as a dynamical quantity, one enters the field of quantum gravity. There is no Zeno effect for time, but no time either in the equations (at the beginning). It takes some work, to find conventional “time” via decoherence in quantum gravity.
As an anecdote, John A. Wheeler suggested the term “watchdog effect” a long time ago. Today “Zeno effect” is more commonly used.