 Feb 2020
 Jan 2020

quantum.country quantum.country

=(α∣0⟩+β∣1⟩)(γ∣0⟩+δ∣1⟩)=αγ∣00⟩+αδ∣01⟩+βγ∣10⟩+βδ∣11⟩.
Might be the answer to an above inquiry.

we apply a Hadamard gate
What is the method to evaluate whether the output of a Hadamard gate should invert the bottom qubit or not?
is (0 + 1) / sqrt 2 high or low?
I'm missing something fundamental here.

equal
Frustrating wording here for me... Why is the word "equal" here at all. Doesn't seem to clarify anything.

quantum teleportation
I was thinking yesterday that "quantum" anything is both much more exciting and much less exciting than we've been led to believe by "Pop Science".
It seems to boil down so far to some fancy linear algebra. I'm sure time will prove me a fool for thinking this, but just want to jot my thoughts down here.

the
For Computer Scientists, Microsoft put together a primer to Quantum Computing for us here: https://www.youtube.com/watch?v=F_Riqjdh2oM
I could understand some of it (through 40m), but think this series of articles will help immensely and I'll return to it after.

What does it mean for a matrix UUU to be unitary? It’s easiest to answer this question algebraically, where it simply means that U†U=IU^\dagger U = IU†U=I, that is, the adjoint of UUU, denoted U†U^\daggerU†, times UUU, is equal to the identity matrix. That adjoint is, recall, the complex transpose of UUU:
Starting to get a little bit more into linear algebra / complex numbers. I'd like to see this happen more gradually as I haven't used any of this since college.

 Jul 2019

en.wikipedia.org en.wikipedia.org

unitary operator is a surjective bounded operator
Why must unitary operator only be surjective? Why not bijective?
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 Mar 2019

complexityzoo.uwaterloo.ca complexityzoo.uwaterloo.ca

Special Complexity Zoo Exhibit: Classes of Quantum States and Probability Distributions 24 classes and counting! A whole new phylum of the Complexity kingdom has recently been identified. This phylum consists of classes, not of problems or languages, but of quantum states and probability distributions. Well, actually, infinite families of states and distributions, one for each number of bits n. Admittedly, computer scientists have been talking about the complexity of sampling from probability distributions for years, but they haven't tended to organize those distributions into classes designated by inscrutable sequences of capital letters. This needs to change.

 Jan 2019

static1.squarespace.com static1.squarespace.com

qualitative leap
I think I found a typo; I fixed it ;)


www.quantamagazine.org www.quantamagazine.org

The new experiment shows that, in a quantum world, two people can end up disagreeing about a seemingly irrefutable result, such as the outcome of a coin toss, suggesting something is amiss with the assumptions we make about quantum reality.

Frauchiger and Renner came up with their thought experiment, which is an extension of something the physicist Eugene Wigner first dreamed up in the 1960s.

 Nov 2018
 Aug 2018

www.wesjones.com www.wesjones.com

Hegel believed that history culminated in an absolute moment  a moment in which a final, rational form of society and state became victorious.
and probably not a bad outcome in an earlier era that thought of things in terms of clockwork and lacked the ideas of quantum theory and its attendant uncertainties.
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 May 2018

pubs.acs.org pubs.acs.org

GreenSynthesisDerived CdS Quantum Dots Using Tea Leaf Extract: Antimicrobial, Bioimaging, and Therapeutic Applications in Lung Cancer Cells

 Apr 2018

www.quantamagazine.org www.quantamagazine.org

“We often discussed his notions on objective reality. I recall that during one walk Einstein suddenly stopped, turned to me and asked whether I really believed that the moon exists only when I look at it.”

 Mar 2018

www.thedivineconspiracy.org www.thedivineconspiracy.org

MIND, MATTER AND THE IMPLICATE ORDER. Paavo Pylkkänen
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www.tcm.phy.cam.ac.uk www.tcm.phy.cam.ac.uk

A new theory of the relationship of mind and matter, David Bohm

 Feb 2018


The NSA must be psyched about this.

 Apr 2016

www.quantamagazine.org www.quantamagazine.org

The notion that counting more shapes in the sky will reveal more details of the Big Bang is implied in a central principle of quantum physics known as “unitarity.” Unitarity dictates that the probabilities of all possible quantum states of the universe must add up to one, now and forever; thus, information, which is stored in quantum states, can never be lost — only scrambled. This means that all information about the birth of the cosmos remains encoded in its present state, and the more precisely cosmologists know the latter, the more they can learn about the former.

 Dec 2015

www.theguardian.com www.theguardian.com

this week’s announcement by Google that a machine made by a Canadian company, DWave Systems, which is marketed as “the world’s first commercial quantum computer”, had shown spectacular speed gains over conventional computers. “For a specific, carefully crafted proofofconcept problem,” Google’s Hartmut Neven reported, “we achieved a 100millionfold speedup.”

 Oct 2015


the strongest evidence yet to support the most fundamental claims of the theory of quantum mechanics about the existence of an odd world formed by a fabric of subatomic particles, where matter does not take form until it is observed and time runs backward as well as forward.

 Feb 2014

empslocal.ex.ac.uk empslocal.ex.ac.uk

The mathematics of almost all eigenvalue problems encountered in wave physics is essentially the same, but the richest source of such problems is quantum mechanics, where the eigenvalues are the energies of stationary states ("levels"), rather than frequencies as in acoustics or optics, and the operator is the hamiltonian.
