I just finished reading Jim Baggott's new book Quantum Reality: The Quest for the Real Meaning of Quantum Mechanics - a Game of Theories. I was attracted to it due to this part of the description: Although the theory quite obviously works, it leaves us chasing ghosts and phantoms; particles that are waves and waves … Continue reading Quantum Reality
With quantum physics, we have a situation where a quantum object, such as a photon, electron, atom or similar scale entity, acts like a wave, spreading out in a superposition, until we look at it (by measuring it in some manner), then it behaves like a particle. This is known as the measurement problem. Now, … Continue reading The measurement problem, Copenhagen, pilot-wave, and many worlds
A recent tweet by Sean Carroll has me thinking. https://twitter.com/seanmcarroll/status/1204128666273271808 Quantum decoherence is said to occur when a particular quantum system becomes entangled with its environment, that is to say, as information about the quantum system spreads throughout the environment, that system undergoes at least an apparent wave function collapse. It stops behaving like a … Continue reading Is entanglement decoherence from the outside, and decoherence entanglement from the inside?
I'm just about finished reading Sean Carroll's Something Deeply Hidden. I was going to wait to post this until I'd completely finished, but all I've got left is the appendix, I perceive that I've gotten through the main points, and discussion on the previous post is veering in this direction. As widely reported, Carroll is … Continue reading Sean Carroll’s Something Deeply Hidden
Albert Einstein, with his theory of special relativity, established that the speed of light is the absolute speed limit of the universe. A rocket ship attempting to accelerate to the speed of light encounters some well known effects: time dilation, mass increase, and length contraction. The closer to the speed of light it gets, the … Continue reading Why you can’t use quantum entanglement for faster than light communication
Last week I started listening to a Sean Carroll podcast episode, an interview of Adam Becker on his book, What Is Real?: The Unfinished Quest for the Meaning of Quantum Physics. Before even finishing the episode, I downloaded Becker's book and read it. Becker starts out in the early decades of the 20th century, when … Continue reading Recommendation: What Is Real?
Related to the post last week on quantum mechanics, here is a talk that got mentioned in the discussion thread. Warning: Carroll is a passionate advocate for the Many Worlds Interpretation, so don't expect a fair and balanced discussion. The video is about an hour long. http://www.youtube.com/watch?v=iXRLDatmbgA A couple of points. Carroll notes that we … Continue reading Sean Carroll on the Many Worlds Interpretation of quantum mechanics
I've been thinking lately about quantum physics, a topic that seems to attract all sorts of crazy speculation and intense controversy, which seems inevitable. Quantum mechanics challenges our deepest held most cherished beliefs about how reality works. If you study the quantum world and you don't come away deeply unsettled, then you simply haven't properly … Continue reading Do all quantum trails inevitably lead to Everett?
I found this video on quantum computing educational. It confirmed some things that I've been pondering about quantum computing for a while, notably its limitations, which are discussed after about the five minute mark. http://www.youtube.com/watch?v=g_IaVepNDT4 The strength of quantum computing is that it makes use of superpositions, the fact that quantum particles can be in multiple … Continue reading Quantum computing will not rescue Moore’s Law
Ethan Siegel on his Starts With a Bang blog has an interesting review of Paul Halpern's new book on Einstein and Schrodinger, and their refusal to allow the implications of quantum physics to dissuade them from idea that the universe is strictly deterministic. It's an interesting post and one that I recommend reading in full. … Continue reading Einstein, Schrodinger, and the reluctance to give up hard determinism