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Rabi oscillations, showing the probability of a two-level system initially in | to end up in | at different detunings Δ. In physics , the Rabi cycle (or Rabi flop ) is the cyclic behaviour of a two-level quantum system in the presence of an oscillatory driving field.
A vacuum Rabi oscillation is a damped oscillation of an initially excited atom coupled to an electromagnetic resonator or cavity in which the atom alternately emits photon(s) into a single-mode electromagnetic cavity and reabsorbs them.
The Rabi frequency is a semiclassical concept since it treats the atom as an object with quantized energy levels and the electromagnetic field as a continuous wave. In the context of a nuclear magnetic resonance experiment, the Rabi frequency is the nutation frequency of a sample's net nuclear magnetization vector about a radio-frequency field.
The Rabi problem concerns the response of an atom to an applied harmonic electric field, with an applied frequency very close to the atom's natural frequency. It provides a simple and generally solvable example of light–atom interactions and is named after Isidor Isaac Rabi .
A simplified version of the Rabi method consists of a beam of atoms, all having the same speed and the same direction, sent through one interaction zone of length .The atoms are two-level atoms with a transition energy of (this is defined by applying a field ‖ in an excitation direction ^, and thus = | ‖ |, the Larmor frequency), and with an interaction time of = / in the interaction zone.
The Rabi oscillations can readily be seen in the sin and cos functions in the state vector. Different periods occur for different number states of photons. What is observed in experiment is the sum of many periodic functions that can be very widely oscillating and destructively sum to zero at some moment of time, but will be non-zero again at ...
Date/Time Thumbnail Dimensions User Comment; current: 15:29, 16 January 2015: 2 min 56 s, 1,920 × 1,080 (80.55 MB): Jubobroff {{Information |Description ={{en|1=animation about the quantum superposition of states, how to measure it with Rabi oscillations, and what decoherence is.
During Rabi flopping the electron oscillates between the ground and excited states and can be described by a continuous rotation around the Bloch sphere. For a perfectly isolated system, a particle undergoing Rabi oscillation between two levels will remain in phase.