All Questions
Tagged with coherence quantum-entanglement
12
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What is the difference between coherence and entanglement? [duplicate]
I am confused to the two terms, my question is what is the difference between coherence and entanglement?
user346139
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1
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Relationships between elements in the density matrix
Say we have a density matrix for a spin-1 system given by:
$$
\hat \rho = \left[\begin{array} A \hat \rho_{00}& \hat \rho_{01} & \hat \rho_{02} \\
\hat \rho_{10} & \hat \rho_{11} & \...
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4
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1
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can entangled photons produce an interference pattern?
Suppose you have a laser that emits entangled photons in opposite directions towards a double-slit screen setup as shown below.
The photons are entangled such that if a photon on the left travels ...
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6
votes
1
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The term "Coherence" is overloaded!
I have troubles with modern terminology in the field of quantum information technologies. There are a lot of new terms that everyone is using and no-one takes time to explain, even though modern ...
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-3
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1
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Never ending quantum superposition? [closed]
So I am wondering over the Copenhagen Interpretation how can a decoherence or measurement ever happen. If in the beginning of the universe everything was in a state of coherence being in ...
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3
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Does the Hong-ou-Mandel effect happen within a delay equal to the coherence time of the two photons?
I read that photon bunching happens for thermal light within the coherence time of the thermal light. That is, if the time for detection is greater than the coherence time of the thermal light, no ...
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1
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Would a collection of entangled particles behave like a superfluid? [closed]
Superfluidity of a Bose-Einstein condensate comes from the fact that all the particles are found in the same quantum state. They are described by the same macroscopic wavefunction. They never collide ...
8
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2
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Conservation of quantum coherence?
Is coherence conserved under unitary transformation?
As we saw in the process of generating entanglement, coherence between states of the subsystem is transferred to quantum correlations (related to ...
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21
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Entanglement and coherence
I have come across a wonderful review of entanglement by Chris Drost in his answer to this post. One part that left me puzzled was: (This post is merely an attempt to understand a portion of Chris' ...
- 1,611
2
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What is the relationship between coherent states and quantum coherence?
What is the relationship between coherent states and quantum coherence? To me coherent states were only talked about in regard to Quantum Harmonic Oscillator, whereas coherence and decoherence on the ...
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What is coherence in quantum mechanics?
What are coherence and quantum entanglement? Does it mean that two particles are the same?
I read this in a book called Physics of the Impossible by Michio Kaku. He says that two particles behave in ...
user29660
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Coherence, Entanglement, Correlation
Let's deal specifically with a two-level system. I understand that ``coherence'' is due to the off-diagonal elements in the density matrix $\rho(t) = \sum_{i}|\psi_i(t)\rangle p_i\langle\psi_i(t)|$ ...
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