The flipping of an electron from either down to up or up to down in the magnetic field in a single energy level system, emits a photon of a particular frequency. That frequency depends on the difference in energy of the electron in up and down states, or vice versa. The same electron in a superposition state (i.e. some arbitrary direction w.r.t.field direction) is being used for quantum memory.
Some details contradict: If you have a single energy level system, the electron is either always up or always down. The energy never changes and no energy is emitted. A magnetic field changes nothing.
If the electron's spin can flip, the system must have two states. Example: Hydrogen line at 1420 MHz. After spin-flip, the energy 5.87433 μeV is emitted. Some say, in form of a photon. Others say, in form of a wave packet. Radio astronomers insist that they receive electromagnetic waves.
@Herbert Weidner
Dear sir,
Then, what about the interaction energy between magnetic moment(u) of electron(depends on spin) and applied magnetic field (B)?.As the electron tries to align along the magnetic field and we apply field opposite to the spin of electron.then obviously it will try to flip and it will flip to align itself along the direction of field.
Ok, then the electron flips. For protons, this the well known Nuclear magnetic resonance. If the external B-field does not change, the electron will not flip again.
@Herbert Weidner
Dear sir..
Ok thanks but i am confused with that how long electron can emit photon or energy by changing direction of field?(emitted energy is energy difference between two spin sates).
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