Idler behavior post signal detection in DCQE

In summary, the delayed choice quantum eraser experiment involves a signal photon and an idler photon being entangled and sent through a double-slit setup. The path of the idler photon can be determined with probability after the signal photon is detected at D0. The idler photon can also be manipulated to show which-way information, but this would result in a violation of the experiment's setup and may produce conflicting results between the idler and signal photons. In short, once the signal photon is detected, the path of the idler photon is fixed probabilistically and any attempt to manipulate it may invalidate the experiment.
  • #1
San K
911
1
Refer to the delayed choice quantum eraser (DCQE) ...for example the kim paper

http://en.wikipedia.org/wiki/Delayed_choice_quantum_eraser" [Broken]

i have a few questions, to understand this better,

1. Once the signal photon has been detected at D0,

can the path of idler photon be determined in terms of probability?

2. for 1 above we would have to wait for the idler to arrive at one of the detectors so that it can be compared/correlated at the co-incidence counter?

3. can the path of the idler be manipulated (for which way or no which way) once the signal photon has been detected (at D0)?

4. let's say we modify the experiment in which:

a) we have do not have which way information (from the idler) at the time the signal photon strikes D0.
b) after the signal photon has struck DO, we manipulate the path of the idler such that we have which way information.
c) we repeat this same procedure/experiment say a million times (with single photons sent at a time of course)

now since we did not have which-way information at the time the signal photon was detected, we would expect an interference pattern.

however the idler would have been manipulated (as per our experiment) to show which way path information.

Question: don't we now have idler and signal saying different things?

Question: is it possible to manipulate the path of the idler (same as question 3, just asking it again), after detection of signal?

Question: can the path of idler be manipulated at all?

Thanks
 
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  • #2
in short what i am trying to say is:

1. once signal photon has been detected at D0, idler path is also "fixed" probabilistically

please say true or false

2. if you try to manipulate the idler path (once signal photon as been detected) you have violated the boundaries/rules/setup of the experiment and its no longer valid

please put true or false
 

1. What is "Idler behavior" in the context of DCQE?

Idler behavior refers to the behavior of the idler photon in a DCQE (detection with continuous quantum efficiency) experiment. In this type of experiment, an idler photon is generated when a signal photon is detected, and its behavior is of interest in understanding the efficiency and accuracy of the detection process.

2. How does the idler photon behave after signal detection in a DCQE experiment?

The behavior of the idler photon after signal detection in a DCQE experiment depends on the specific experimental setup and conditions. Generally, the idler photon will either be absorbed by a detector or continue on its path, potentially interacting with other particles or being detected by another detector.

3. What factors can influence idler behavior in DCQE experiments?

There are several factors that can influence idler behavior in DCQE experiments, including the type of detectors used, the intensity and wavelength of the signal photon, and the distance between the signal and idler detectors. Other experimental conditions, such as temperature and pressure, may also play a role.

4. How is idler behavior post signal detection studied in DCQE experiments?

Idler behavior post signal detection is typically studied through a combination of theoretical modeling and experimental measurements. Researchers may use mathematical and computational models to simulate the behavior of the idler photon, and then compare the results to actual data collected from the experiment.

5. What are the potential applications of studying idler behavior in DCQE experiments?

Understanding idler behavior in DCQE experiments can have practical applications in fields such as quantum information processing and quantum communication. By studying and optimizing the behavior of the idler photon, researchers can improve the efficiency and accuracy of these technologies, leading to advancements in areas such as secure communication and quantum computing.

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