Quick Electromagnetically Induced Transparency Question

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In summary, for EIT, a magnetic field is required for Zeeman splitting which allows for measuring the Earth's magnetic field strength. However, if completely different states are used, Zeeman splitting is not necessary and the sensitivity of the EIT effect may vary for degenerate states.
  • #1
jaketodd
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Do you need a magnetic field for EIT, or just two electromagnetic beams with the right attributes?

Thanks,

Jake
 
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  • #2
If I remember correctly, you need some Zeeman splitting. The magnetic field of Earth is sufficient, and you can use EIT to measure its field strength.
 
  • #3
mfb said:
If I remember correctly, you need some Zeeman splitting. The magnetic field of Earth is sufficient, and you can use EIT to measure its field strength.

Why would you need Zeeman splitting, if an atom already has three states without splitting any of them?
 
  • #4
If you use completely different states that is not an issue, you are right. I am not sure how sensitive the EIT effect is for different (degenerate) states if you have no Zeeman splitting.
 

Related to Quick Electromagnetically Induced Transparency Question

What is Quick Electromagnetically Induced Transparency (QEIT)?

Quick Electromagnetically Induced Transparency (QEIT) is a phenomenon in which the absorption of light in a medium can be dramatically reduced by applying a control field. This allows for the creation of transparent regions in the medium, allowing light to pass through without being absorbed.

How does QEIT work?

QEIT works by using a control field, typically a laser beam, to manipulate the energy levels of atoms in the medium. This creates a two-level system in which the absorption of light is greatly reduced. This effect is temporary and can be switched on and off by controlling the intensity and frequency of the control field.

What are the applications of QEIT?

QEIT has many potential applications in fields such as quantum computing, optical data storage, and telecommunications. It can also be used in sensors and detectors for more accurate measurements. Additionally, the ability to control the transparency of a medium can be useful in creating optical switches and filters.

What are the limitations of QEIT?

One limitation of QEIT is that it typically requires very low temperatures for the medium, making it difficult to use in practical applications. Additionally, the control field used can sometimes cause unwanted heating in the medium, affecting the transparency of the system. Finally, the duration of the transparency effect is limited, making it necessary to continually apply the control field to maintain the desired transparency.

How is QEIT related to other quantum phenomena?

QEIT is related to other quantum phenomena such as electromagnetically induced transparency (EIT) and coherent population trapping (CPT). These all involve manipulating the energy levels of atoms in a medium to control the absorption and transmission of light. However, QEIT is typically faster and can be achieved at higher temperatures compared to EIT and CPT.

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