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152:, the atom's energy levels acquire perturbations to the excited states that describe the atom's internal state. When the acquired phase is the same over the range of internal states, the atom is coherent. Atomic coherence is characterized by the length of time over which the internal state of the atom can be reliably manipulated.
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For a perfectly isolated system, a particle undergoing Rabi oscillation between two levels will remain in phase. In practice, interactions between the system and the environment introduce a phase offset in the Rabi oscillation between the two levels, causing
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Xu, Wenchao; Venkatramani, Aditya V.; Cantú, Sergio H.; Šumarac, Tamara; Klüsener, Valentin; Lukin, Mikhail D.; Vuletić, Vladan (2021-07-27). "Fast
Preparation and Detection of a Rydberg Qubit Using Atomic Ensembles".
393:) is prepared and continuously addressed with a laser, all the atoms will coherently Rabi flop. All two level systems will initially have a defined relative phase and the system will be coherent.
195:, in a trapped ion and in neutral atoms . Similarly, the coherence time can be characterized by measuring the population transfer over time of an atom undergoing Rabi oscillations .
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field noise and thermal heating from collisions between atoms cause decoherence faster than random spontaneous emission and are the dominant uncertainties when running
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their Rabi oscillations will accumulate a random relative phase with respect to each other and become decoherent. In actual experiments ambient
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Wang, Pengfei; Luan, Chun-Yang; Qiao, Mu; Um, Mark; Zhang, Junhua; Wang, Ye; Yuan, Xiao; Gu, Mile; Zhang, Jingning; Kim, Kihwan (2021-01-11).
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240:. During Rabi flopping the electron oscillates between the ground and excited states and can be described by a continuous rotation around the
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If instead of a single two-level system, an ensemble of identical two level systems (such as a chain of identical atoms in an
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de Léséleuc, Sylvain; Barredo, Daniel; Lienhard, Vincent; Browaeys, Antoine; Lahaye, Thierry (2018-05-03).
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Meiser, D.; Holland, M. J. (2010-03-29). "Steady-state superradiance with alkaline-earth-metal atoms".
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Wineland, D.J.; Monroe, C.; Itano, W.M.; Leibfried, D.; King, B.E.; Meekhof, D.M. (May 1998).
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creates coherent atomic beams, where the coherence is with respect to the phase of the atom's
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Research of the National Institute of Standards and Technology
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Atomic coherence is essential in research on several effects, such as
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The internal state of an atom is characterized by a superposition of
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fringes has been used to measure the relaxation time,
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Type of state of an atom-electromagnetic field system
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