All Questions
26 questions
3
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119
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How is quantum entanglement detected experimentally?
What type of detector was used to detect entanglement of different systems, for example, photons?
Are there new detectors being made now?
What technique is used for this detection?
- 119
0
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0
answers
48
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Where to find the Expectation Values of Aspect's and Clauser Experiments [duplicate]
Alain Aspect and John Clauser won the Nobel Prize in Physics for their epxeriments on quantum entanglement. Does anyone know where to find the raw data or at least published calculated expectation ...
0
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0
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54
views
How efficient are coincidence counting techniques?
Obviously there is a limitation as to how well experimental configurations that depend on coincidence counting can efficiently remove the noise present at any given experiment. This leads me to ...
3
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5
answers
596
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How far are we from actual test that gravity is quantum?
As we all know, probing the Planck scale directly is still far beyond our current technologies. But I've heard that proving that in fact gravity is quantum should be much easier and we are not that ...
- 305
2
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0
answers
122
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Have objective collapse theories been ruled out by recent experiments?
Have objective collapse theories been ruled out by recent experiments, such as the entanglement of macroscopic objects? (vibrating drumheads)
- 31
0
votes
1
answer
74
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IBM Quantum Circuit output probabilities for single Hadamard gate
I am new to using the IBM Quantum Emulator, and I encounter this result which I don't understand:
The input is a single 0 bit that is passed into a Hadamard gate (click the picture to enlarge). I ...
user315366
0
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0
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177
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Experimental Implications of Wigner Distribution
I'm interested in the experimental implications of the Wigner quasiprobability distribution in quantum physics, but haven't been able to find anything that addresses my particular question.
...
- 1
1
vote
1
answer
98
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Delayed Choice Quantum Eraser variation results
If we were to start with the delayed choice quantum eraser setup in the attached image, what would the interference pattern look like for the photons at D0 if D3 and D4 were eliminated (and the two ...
- 11
1
vote
1
answer
630
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What is the effect of magnetic fields applied to an entangled pair of particles?
Just curious...if we can create a pair of entangled particles and position one of them in a strong magnetic field would it have as a consequence that we can't change the spin of the other because that ...
- 467
-1
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2
answers
147
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Is the speed of quantum entanglement interaction greather than $c$? [duplicate]
How much time should not elapse between measurements of e- and e+ spin computed at a distance ot 1km to not detect effects of the entanglement? There should be a finite speed? Maybe greater than $c$?...
- 467
3
votes
0
answers
95
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Can we create "asymmetric" EPR pairs in experiments?
Asymmetric here is just for lack of a better word.
What I am looking for are experiments that can create a simple EPR pair but without 50% 50% chance of each state.
As I understand from standard ...
- 61
1
vote
0
answers
51
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Is it possible to reconduct "The delayed quantum eraser experiment" in home?
The delayed quantum eraser was conducted by Kim et al. in 1999 with the use of BBO crystals, polarizers, detectors and so on. I believe some of these equipments can be found online kinda cheaply, ...
- 19
0
votes
1
answer
119
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Why don't quantum gates get entangled with the qubits they operate on?
I am currently taking a first course in quantum information theory and having trouble understanding how quantum gates are possible in practice. How does a unitary quantum gate evolve the qubit without ...
0
votes
3
answers
556
views
Example of experimental or observational proof of quantum indeterminacy before measurement
How do we know that certain properties are indeterminate or undefined until they are measured?
Take the example of quantum entanglement, saying that if you have two entangled particles, such as the ...
- 55
0
votes
2
answers
183
views
Can the color of an object be entangled?
Based on the answer to another question asking "What properties can be entangled? the answer to the question was "any property". But with all due respects to the answer, I must admit I am somewhat ...
user86411
0
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0
answers
146
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Where I can find quantum entanglement, real experimental raw data
For analysis purpose, I am looking for raw data from real entanglement experiment with spin measured at two detectors, at various combinations of angles, but preferably at a single combination of ...
- 4,519
0
votes
1
answer
91
views
Optical Parametric Amplifier performance compared to Optical Parametric Oscillator
I am trying to design a bright source of polarization entangled beams of photons so that it is visible to human eye. I have to decide between OPA and OPO. OPAs are cheap and simple to develop compared ...
- 570
4
votes
2
answers
1k
views
Is this double "double slit experiment" involving entanglement possible?
The experiment goes as follows:
Put a particle emitter (photon, electron etc.) between a pair of double slits. The emitter launches pairs of particles that are entangled in such a way that if one ...
- 153
2
votes
6
answers
420
views
EPR paradox: instantaneous vs very fast?
An EPR quantum experiment can be explained by instantaneous collapse of the wave function regardless of the distance separating a pair of entangled particles. But do we have the certainty that the ...
- 1,227
2
votes
1
answer
244
views
What are the current obstacles to experimentally testing quantum pseudo telepathy?
Quantum pseudo-telepathy refers to how, in some specific coordination games, isolated players can do better when they have pre-shared some entangled qubits. I understand how it works in theory and ...
- 7,142
0
votes
3
answers
3k
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Using quantum entanglement to send messages back to the past [duplicate]
Possible Duplicate:
Entanglement in time
I heard that there is an experiment that uses quantum entanglement to try to send messages back to the past. I am having a hard time understanding how ...
- 695
9
votes
2
answers
1k
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Quantum Computing, Qubit Creation/Entanglement
I am currently a high school student researching quantum computing. I was referred to this site by Google and a friend. Currently I am researching the qubit part of quantum computing. My question is ...
4
votes
2
answers
554
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Coincidence detectors in Bell tests: How close is close enough?
When is a coincidence a coincidence? We know that to identify entangled photons, the electronics is set to look for simultaneous clicks at opposite detectors. The size of the window is to some degree ...
- 4,219
9
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2
answers
1k
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Has quantum entanglement been demonstrated to be able to take place over infinite distances?
In my poor understanding of quantum physics, quantum entanglement means that certain properties of one of two 'entangled' quantum particles can lead to change over infinitely large distances when the ...
- 431
4
votes
1
answer
6k
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Quantum Entanglement: how to generate 2 entangled particles?
I get quantum entanglement but I don't quite get how one would go about generating two complementary particles that are entangled (a photon and its entangled sibling, an electron and its entangled ...
- 187
8
votes
2
answers
879
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How do electrons interact if one of them had just exited the two slits of the double-slit experiment?
Consider the following experiment: a double-slit set-up for firing electrons one at a time. Let's now add a second electron (orange), which is fired parallel to the first one, but in the opposite ...
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