The Physical Reality of Applied Quantum Optics The Physical Reality of Applied Quantum Optics (original) (raw)
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Approximate quantum statistical properties of a nonlinear optical coupler
Physics Letters A, 2004
An asymmetric optical coupler, arising out of the combination of a linear and a quadratic waveguides, is exploited to study the quantum statistical properties of the input coherent light passing through it. The Heisenberg equation of motion for the field operators are found to give coupled nonlinear differential equations. Under the weak field approximations, these coupled differential equations are solved by using an intuitive approach. The solution for the field operators are used to obtain the analytical expressions for squeezing, photon bunching, photon antibunching and the nonclassical photon statistics of the input coherent light. These analytical expressions are quite complicated to draw any conclusions. To keep up the analytical flavour, we simplify them further to discuss the squeezing, photon bunching, photon antibunching and nonclassical photon statistics of the input coherent light in single and compound field modes.
Nonlinear quantum optics in the (ultra)strong light-matter coupling
2014
The propagation of N photons in one dimensional waveguides coupled to M qubits is discussed, both in the strong and ultrastrong qubit-waveguide coupling. Special emphasis is placed on the characterisation of the nonlinear response and its linear limit for the scattered photons as a function of N, M, qubit inter distance and light-matter coupling. The quantum evolution is numerically solved via the Matrix Product States technique. Both the time evolution for the field and qubits is computed. The nonlinear character (as a function of N/M) depends on the computed observable. While perfect reflection is obtained for N/M 1, photon-photon correlations are still resolved for ratios N/M= 2/20. Inter-qubit distance enhances the nonlinear response. Moving to the ultrastrong coupling regime, we observe that inelastic processes are robust against the number of qubits and that the qubit-qubit interaction mediated by the photons is qualitatively modified. The theory developed in this work modelis...
Quantum correlations in optics
Pramana, 1998
In many nonlinear optical problems, for example in down-conversion and four-wave mixing, the photons are generated in pairs. The strong correlation between the photons in a pair, characterized by either the correlations between operators corresponding to observables associated with individual photons, or the correlated state describing the two photons, may lead to various nonclassicalities. We discuss some of these nonclassical effects and their experimental demonstrations in nonlinear optical processes.
J ul 2 01 7 Journeys from Quantum Optics to Quantum Technology
2018
Stephen M. Barnett1, Almut Beige2, Artur Ekert3, Barry M. Garraway4, Christoph H. Keitel5, Viv Kendon6, Manfred Lein7, Gerard J. Milburn8, Héctor M. Moya-Cessa9, Mio Murao10, Jiannis K. Pachos2, G. Massimo Palma11, Emmanuel Paspalakis12, Simon J. D. Phoenix13, Bernard Piraux14, Martin B. Plenio15, Barry C. Sanders16,17,18,19, Jason Twamley20, A. Vidiella-Barranco21, and M. S. Kim22 1 School of Physics and Astronomy, University of Glasgow, Glasgow G12 8QQ, UK 2 The School of Physics and Astronomy, University of Leeds, Leeds LS2 9JT, UK 3 Mathematical Institute, University of Oxford & Centre for Quantum Technologies, National University of Singapore. 4 Department of Physics and Astronomy, University of Sussex, Falmer, Brighton, BN1 9QH, UK 5 Max-Planck-Institut für Kernphysik, Saupfercheckweg 1, 69117 Heidelberg, Germany 6 Department of Physics, Durham University, South Road, Durham DH1 3LE, UK 7 Institute for Theoretical Physics, Leibniz Universität Hannover, 30167 Hannover, Germany ...
Applied Physics B Photophysics and Laser Chemistry, 1982
... Rev. A14, 1151 (1976) 13. FT Hioe, JH Eberly: Phys. Rev. Lett. 47, 838 (1981) 14. ... 1). 2) There is the time delay between the beginning of the photon pulse and the time when two-photon effects starts. It is proportional to z ~ 1/o)~. 1. SB Haley, P. Erd6s: Phys. Rev. ...
FD 178: Nonlinear quantum optics in the (ultra)strong light-matter coupling
Faraday Discuss., 2014
The propagation of N photons in one dimensional waveguides coupled to M qubits is discussed, both in the strong and ultrastrong qubit–waveguide coupling. Special emphasis is placed on the characterisation of the nonlinear response and its linear limit for the scattered photons as a function of N, M, qubit inter distance and light–matter coupling. The quantum evolution is numerically solved via the matrix product states technique. The time evolutions for both the field and qubits are computed. The nonlinear character (as a function of N/M) depends on the computed observable. While perfect reflection is obtained for N/M ≅ 1, photon–photon correlations are still resolved for ratios N/M = non-zero. Inter-qubit distance enhances the nonlinear response. Moving to the ultrastrong coupling regime, we observe that inelastic processes are robust against the number of qubits and that the qubit–qubit interaction mediated by the photons is qualitatively modified. The theory developed in this wor...
Quantum effects in nonlinear optics and polaritonics
2018
The main scope of this thesis is the investigation of quantum properties of nonlinear, dissipative, optical and condensed matter systems. Compared with previous studies on this subjects, we reached several milestone of general interests for the theoretical and experimental community. The main experimental platform we refer to in this thesis is microcavity polaritons: polaritons arise from the coupling of light with excitons in a quantum well, i.e., a 2D semiconductor material embedded in the microcavity. They have attracted the interest of the scientific community for their rich physics. Polaritons can form out-of-equilibrium Bose-Einstein condensates, they can experience superfluid phase transition and, due to their interaction via the excitonic component, they show a variety of phenomena which are typical of nonlinear physics, such as bistability and parametric scattering. In particular, motivated by recent proposals about the generation of single photons from weakly nonlinear sys...