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mcherm : quantummechanics   38

An important quantum algorithm may actually be a property of nature - MIT Technology Review
Grovner's algorithm does a search in sqrt(N) using a quantum computer. Electrons may find flaws in some crystal surfaces that efficiently. Also, an optimal Grovner search among 4 alternatives takes 1 step; among 20 alternatives takes 3 steps. Does this explain 4 bases, 20 amino acids in DNA? (Probably not.)
physics  quantummechanics  quantumcomputing  quantum  biology  via:HackerNews 
5 weeks ago by mcherm
Quantum computing for policymakers and philosopher-novelists
Quantum computers will be available soon. They'll be useful for quantum simulations, and will break non-quantum-resistant public key cryptography. Might provide some speedup (square root of classical steps)on other general problems.
quantumcomputing  quantummechanics  via:ScottAaronson  ScottAaronson 
june 2018 by mcherm
Scott Aaronson Answers Every Ridiculously Big Question I Throw at Him - Scientific American Blog Network
Lots of questions about quantum computing explained incredibly well. Also a great explanation of why P=?=NP is such an important problem.
ScottAaronson  computerscience  quantumcomputing  ScientificAmerican  via:SlateStarCodex  quantummechanics 
may 2016 by mcherm
If Many-Worlds Had Come First - Less Wrong
A great explanation of why the "many worlds" hypothesis for quantum mechanics makes much more sense than the widely believed alternative.
physics  quantummechanics  EliezerYudkowsky 
december 2015 by mcherm
New math and quantum mechanics: Fluid mechanics suggests alternative to quantum orthodoxy -- ScienceDaily
Pilot wave: a different interpretation of quantum mechanics. It avoids the "collapse on observation" of Copenhagen but adds non-local interaction.
physics  quantummechanics  via:reddit 
september 2014 by mcherm
What does mercury being liquid at room temperature have to do with Einstein’s theory of relativity? | The Curious Wavefunction, Scientific American Blog Network
To predict that gold is yellow or that mercury is liquid at room temperature, you need to take into account relativistic corrections to the quantum mechanical calculations of orbital size. And when you do, it works out correctly.
science  physics  chemistry  quantummechanics  ScientificAmerican  via:HackerNews 
august 2013 by mcherm
The Quantum Earthworm – Phenomena: The Loom
How do you manufacture quantum dots (microscopic bits of certain metals, preferably bound to organics that make them less poisonous)? Feed them to earthworms.
biology  science  physics  quantummechanics  via:HackerNews 
january 2013 by mcherm
Black Hole Firewalls Confound Theoretical Physicists | Simons Foundation
an interesting paradox that theoretical physics is wrestling with right now.
physics  via:reddit  science  quantummechanics 
december 2012 by mcherm
Quantum measurements leave Schrödinger's cat alive - physics-math - 03 October 2012 - New Scientist
I'll admit I don't understand this one fully. They probed a quantum superposition to observe some orthogonal properties (the frequency of change) without affecting the property of interest (the phase). I think.
via:slashdot  physics  quantummechanics 
october 2012 by mcherm
Shtetl-Optimized » Blog Archive » Shor, I’ll do it
An explanation of Shor's algorithm (factoring with a quantum computer) without any math.
quantummechanics  science 
september 2012 by mcherm
Why Many-Worlds is not like Copernicanism
Scott Aaronson believes the multiple-worlds theory of quantum mechanics, but he does not believe that it is so blindingly obvious that anyone who doubts it must be ignorant.
quantummechanics  ScottAaronson  via:ScottAaronson  philosophy 
august 2012 by mcherm
PHYS771 Lecture 9: Quantum
A mathematical explanation of why quantum mechanics is the "obvious" theory.
math  physics  quantummechanics  ScottAaronson  via:HackerNews 
august 2012 by mcherm
Relativity Powers Your Car Battery | Physical Review Focus
Lead-acid batteries work (while Tin-acid batteries don't) because the electrons are going fast enough to get relativistic effects.
science  physics  chemistry  quantummechanics  relativity  via:reddit 
january 2011 by mcherm
Jonathan Oppenheim - the uncertainty principle determines nonlocality
An essay comparing quantum entanglement to a simple game with probabilities, and demonstrating that there is a connection between uncertainty and action-at-a-distance.
physics  via:slashdot  science  quantummechanics  quantum 
november 2010 by mcherm
A tale of two qubits: how quantum computers work
An *extremely* accessible, yet still honest and accurate explanation of some basics of quantum mechanics, including, in particular, superposition. I'm not sure whether it says anything interesting about quantum computing, but it certainly does a good job with Bell's Paradox.
quantummechanics  science  physics  ArsTechnica  via:ArsTechnica  quantum  quantumcomputing 
january 2010 by mcherm
Schneier on Security: Quantum Cryptography Cracked
An example of a "secure" quantum cryptography system being cracked by inducing the detectors at the ends to reveal information.
via:BruceSchneier  BruceSchneier  quantummechanics  security  cryptography 
january 2010 by mcherm
Quantum gravity theories wiped out by a gamma ray burst - Ars Technica
A single photon detected in a space telescope disproves a category of possible quantum-mechanics / general relativity unifications.
physics  science  astronomy  quantummechanics  via:reddit 
october 2009 by mcherm
Quantum computing may actually be useful, after all
Quantum computing is shown to be effective in solving systems of linear equations. Instead of solving it in linear time, it solves it in logarithmic time. Extracting the answer still requires linear time, but if all you need is a computation of the answer then you can get it fast. Well written article.
via:HackerNews  quantummechanics  quantumcomputing  computerscience 
october 2009 by mcherm
Quantum Entanglement Visible to the Naked Eye | Wired Science | Wired.com
Quantum mechanics on the millimeter scale. Not actually visible unless your eyes can see magnetic fields, but if you COULD, then hey!
quantummechanics  physics  science  via:reddit 
september 2009 by mcherm
Technology Review: Blogs: arXiv blog: How Entanglement Could Be Deterministic
A new form of "hidden variable" that could explain entanglement and is NOT prohibited by the known laws of quantum mechanics. It is expressed in a cellular automaton.
physics  quantummechanics  via:slashdot  math 
august 2009 by mcherm
Physical reality of string theory demonstrated | Eureka! Science News
Wow! This is the first time I have heard of String Theory either making a verifiable claim or (in this case) providing explanatory power for a physical phenomenon which wasn't "baked into" the theory from the start. Perhaps string theory shouldn't be completely dumped. (But I'd say the jury is still out.)
physics  quantummechanics  science  stringtheory 
july 2009 by mcherm
The QIS workshop » Shtetl-Optimized
Several interesting things here, if you can understand them. The most interesting is that some curious properties designed by people studying the math called "quantum information theory" turn out to be key to a molecule that is at the heart of photosynthesis.
via:ScottAaronson  ScottAaronson  physics  computerscience  quantummechanics  quantumcomputing 
may 2009 by mcherm
Time: Different from space » Shtetl-Optimized
A coherent explanation of how the minus sign in the time component of a 4-vector makes it different from the spacial dimensions. Then it wanders off into computational complexity arguments.
quantummechanics  computerscience  computationalcomplexity 
april 2009 by mcherm
A Neighborhood of Infinity: Faster than a speeding photon
If you are constantly accelerating then some photons headed in your direction will never catch up. This is like a black hole's event horizon. We can detect the effect, or perhaps not since the feature detected is predicted by normal formulas also.
pyhsics  via:reddit  science  quantummechanics 
april 2009 by mcherm
High-powered mathematicians take on free will - Princeton University
John Conway claims to have a mathematical theorem that if quantum mechanics works as observed AND if humans have "free will" (the ability to make decisions independent of past events), then elementary particles also have "free will".
math  philosophy  via:HackerNews  JohnConway  freewill  physics  quantummechanics 
march 2009 by mcherm
PHYS771 Lecture 19: Time Travel
Time travel and whether or not it can be used to build computers that solve NP problems in P time.
programming  computerscience  math  quantummechanics  timetravel  physics 
august 2008 by mcherm
The Limits of Quantum Computers (DRAFT)
Article for Scientific American (this is the draft) about quantum computers.
quantummechanics  programming  physics 
february 2008 by mcherm

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