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Single Photon Devices
Published in Klaus D. Sattler, st Century Nanoscience – A Handbook, 2020
Hamza A. Abudayyeh, Boaz Lubotzky, Ronen Rapaport
where |n〉 is called a Fock state of the field, i.e. a state containing exactly n photons. In a multimode field the superposition must be extended to include all the component modes. Therefore in general, a mode has a distribution over the photon numbers given by P(n)=⟨Ψ|n^|Ψ⟩=|cn|2
Quantum Theory of Light: The State of Quantized Field and Photon
Published in Yanhua Shih, An Introduction to Quantum Optics, 2020
are both two-photon states (n = 2) but characterize different physics. The state in Eq. (3.1.9) indicates the excitation of two different radiation modes with occupation numbers nk,s = 1 and nk′,s′ = 1. The state in Eq. (3.1.10) indicates the excitation of a radiation mode with occupation number nk,s = 2. Such states in Eq. (3.1.8), Eq. (3.1.9), and Eq. (3.1.10) are all known as Fock states, or photon number states. Again, shorten the notation, it is also common to write the two-photon state as |Ψ〉 = |1k,s, 1k′,s′〉 and |Ψ〉 = |2k,s〉, one should not forget the vacuum states of the other modes.
Nonlinear Dynamics in Quantum Photonic Structures
Published in Joachim Piprek, Handbook of Optoelectronic Device Modeling and Simulation, 2017
Gabriela Slavcheva, Mirella Koleva
Photon-number (Fock) states are states of light containing a specific number of photons. The single-photon state is a special case of a Fock state and is a squeezed-light state [4], a quantum state of light resulting from the Heisenberg relations with, e.g., reduced amplitude fluctuations at the expense of enhanced fluctuations of the phase. An ideal amplitude-squeezed source delivers a stream of photons at regular time intervals, which is the precise realization of a single-photon source [5].
Nonclassical properties of a deformed atom-cavity field state
Published in Journal of Modern Optics, 2022
Naveen Kumar, Arpita Chatterjee
The conventional Jaynes–Cummings model (JCM) [1] describes the atom-cavity interaction as a two-level atom is colliding with a single mode of the electromagnetic field in the matter–radiation coupling. This model is proposed as a basic design to investigate the semiclassical behaviour of quantum radiation field [2]. The generalized Jaynes–Cummings model, illustrating the nonlinear interaction of a two or multi-level atom with a cavity field, results a deformed JCM structure. In quantum optics and quantum information processing [3], the nonclassical light field is of major interest for a number of reasons. In an all-optical quantum information processing device [4], the single-photon Fock state, a nonclassical state, is an essential resource. Controlling the emission of a single radiator, such as a molecule or a quanta [5], can be used to create these states. Fock state can also be prepared using cavity QED experiments in which atoms interact one at a time with a high Q resonator. A π quantum Rabi pulse in a microwave cavity [6] or an adiabatic passage sequence in an optical cavity [7] can produce a one-photon Fock state in this way. The study of these states yields a fundamental understanding of quantum fluctuations and a new method of quantum communication or imaging that surpasses the standard quantum noise limit. Nonclassical states have a wide range of real-world applications. For example, squeezed states are used to reduce the noise level in one of the phase-space quadratures below the quantum limit [8], entangled states are employed to realize a quantum computer and to transfer quantum information [9]. Here under the rotating-wave approximation (RWA), we investigate the dynamics of two-photon correlations generated by the interaction of a semiclassical two-level atom with a single-mode cavity field.