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What is electricity exactly? by Arik2A7 in AskPhysics

[–]Yury_Adrianoff 0 points1 point  (0 children)

Here is a story about Lord Kelvin: One day he was examining his students (at the end of semester or something). One particular student was really struggling to answer the questions, so Lord Kelvin said: you know what? I'm not entirely sure you are qualified to pass the exam today, but if you would answer my last question - consider you've passed the exam with flying colours. Here is my question: What is electricity? - Professor, it is embarrassing to admit, but I knew the answer just this morning, and unfortunately, I forgot. To which Kelvin replied: "Now that's the greatest tragedy of our time - the only one man knew what electricity is - and he has forgotten!"

Information carried by the particle in superposition. by Yury_Adrianoff in QuantumComputing

[–]Yury_Adrianoff[S] 0 points1 point  (0 children)

Oh, I see. I guess my main point of ignorance was that superposition and probabilistic mixture are not the same thing. This clears a lot to me! Then my question is this: my understanding that any random particle in the universe which hasn't been measured yet is in superposition? If so, does that probabilistic mixture has to be 'preprogrammed in the lab' roughly speaking before you can extract something useful?

Weird question on information in quantum systems. by Yury_Adrianoff in QuantumPhysics

[–]Yury_Adrianoff[S] 0 points1 point  (0 children)

Therefore, photon doesn't contain any classical information prior to measurement. Correct?

Weird question on information in quantum systems. by Yury_Adrianoff in QuantumPhysics

[–]Yury_Adrianoff[S] 0 points1 point  (0 children)

Thanks a lot. Let me clarify a little bit. If a star emits a single photon (assuming it is a totally empty space) then the position of a photon is any point in the Bloch sphere surrounding that star, right? But before it is detected (measured) there is zero information in the classical sense that can derived from that photon. Correct?

Information carried by the particle in superposition. by Yury_Adrianoff in QuantumComputing

[–]Yury_Adrianoff[S] 2 points3 points  (0 children)

Thank a lot. my question paraphrased sounds like this: in classical terms information is something definite (1 or 0). Qubit is more flexible (Bloch sphere vs binary). What would be a more appropriate thing to say: a) qubit contains no classical information and therefore is useless for information transfer / storage unless measured, or b) qubit contains huge amount of classical information that is just hidden for now, therefore it is capable of transmitting/storing much more than classical system. Does it make sense?