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Physics
Atomic and Condensed Matter
Ramsey spectroscopy and spin echoes
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[QUOTE="Fred Wright, post: 6470139, member: 570722"] If you isolate your experiment such that the only cause of detuning is 1/f noise, then you can take advantage of the fact that with 1/f noise there is no energy transfer to the environment. 1/f noise is reversible to some extent. Apply the ##\frac{\pi}{2}## pulse to the system with the spin vector aligned with the z axis of the Bloch sphere. The spin vector is knocked to x-y plane and suffers free evolution with its phase being slightly jostled about by the 1/f noise and detuning for a time ##T_2##. Then the ##\pi## pulse is applied which reflects the spin vector in the x-y plane. The system again suffers free evolution for time ##T_2## but the phase trajectory of the spin vector doubles back on itself cancelling the first detuning period (Amazing!). A second ##\frac{\pi}{2}## is applied kicking the spin vector back to original orientation along the z axis. [/QUOTE]
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Ramsey spectroscopy and spin echoes
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