Recent content by Joao

Thanks a lot for the reply, once again, Peter! Now I have a clearer vision the experiment! It's very kind of you to take your time to answer my threads! Have a great weekend, and thanks for your amazing efforts moderating this forum! =)

Hi Peter! Thanks again for the reply! My original message was cut, somehow my browser has issues when posting something here... I'll try to be more careful! What was next was: but how can Wigner measure a Lab? I can understand how someone measures a particle, but not how someone measures a...

I will try to describe the Frauchiger and Renner thought experiment: 1. Participants: Wigner1, friend1, Wigner2, friend2. 2. Friend1 is in lab1, friend2 is in lab2. 3. Friend1 tosses a coin that has 1/3 of chance of being heads and 2/3 of chance of being tails. 4. If the coin is heads, he makes...

Thanks a lot for the answer!

1. Wigner's friend is inside a lab, and has a pair of entangled photons. 2. He measures one in the vertical axis. 3. He sends the other photon to Wigner. 4. Wigner can: a) measure it in the vertical axis (if so, he will get the same result as Wigner's friend). 5. Or Wigner can: b) send the...

Hi everyone! Sorry for the bad english! Paper: https://arxiv.org/abs/1902.05080 I guess I understood the experiment until the moment Alice and Bob chooses to measure A0(B0) or A1(B1). I guess it's kind of straightforward that without a bell state measurement with photon alfa(beta) and photon...

Thanks a lot for the answer! Now that's a possibility I didn't considered and, to be honest, I don't fully understand! I'll try to look more into what you just said! Thanks!

Hi everyone! Sorry for the bad english! So, just a quick doubt... Does things collapse from a wave of probability into a quantum field or is the wave in the quantum field the probabilistic wave itself? An example to make it clearer: Suppose we have an atom, it enters an atom interferometer, it...

Thanks a lot for the answer Doctor! Yes! I'm talking about that! More specifically, I'm trying to make sense of "On the other hand, when Victor performs the separable-state measurement on photons 2 and 3 and does not swap entanglement, the correlation only exists in the (Horizontal and...

Hi everyone! Sorry for the bad english! I'm trying to understand the "delayed choice entanglement swapping" (avaliable in https://arxiv.org/abs/1203.4834 ) and (long story short) , in the article we have pairs of photons that are entangled in the ## \phi \pm ## Bell state and the photons...

Thanks a lot! It really helped me to understand it! Now I can do the math of a quantum eraser circuit all by myself! Now I'm going to try to do the math of a superdense coding circuit! Thanks a lot for helping me get a better understanding of the universe we live in! =)

Thanks for the reply! I've already learned to play around with the quirk simulator! Now I'm trying learn how to do the math by myself, hoping to get a better understanding of how quantum mechanics works! =)

Thanks for the replys! Let me try again! =) So, I want to do the math of a quantum eraser circuit. We start with 2 qubits at state q0 = |0> q1 = |0> Now we apply a hadamart matrix in q1 ## \begin{pmatrix} 0,7 & 0,7 \\ 0,7 & 0,7 \end{pmatrix} ## times ## q1= \begin{pmatrix} 1 \\ 0...

Hi! Sorry for the bad English! I'm trying to get a better understanding in quantum mechanics by doing the math of quantum circuits and I'm stuck! So, please, if someone can, help me! =) I'm trying to the math of this circuit: q0 ... l 0 ) .... x ... (I) q1 ...

Hi everyone! Sorry for the bad English! I'm trying to read the "entanglement between photons that never coexisted " from 2012. Avaliable at: https://arxiv.org/abs/1209.4191 And there's this equation: ## |φ± \rangle = \frac 1{√2}(|HaHb ± |VaVb\rangle) ## ## |ψ± \rangle = \frac 1{√2}(|HaVb ±...