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Nano Photonics
Quantum Optics
Implementations of Quantum Information
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Title  Category  Date  Authors 
Quantum storage and retrieval of light by sweeping the atomic frequency University of Calgary  Publication  20130801  H. Kaviani, M. Khazali, R. Ghobadi, E. Zahedinejad, K. Heshami, C. Simon  Deterministic conditional phase gate with Rydberg atomsOne of the most promising ways to implement deterministic quantum conditional gate between individual photons is to use the interaction between the large dipole moments of Rydberg polaritons. The multimode character of pulses imposes constraints on implementation of high fidelity quantum gates. To overcome this problem, we have shown that parallel orientation of the dipoles results in optimum fidelity. Additionally, we also have obtained the analytical form for both the induced phase and the fidelity between polaritons for the case that the length of the interaction region is much greater than the size of the polariton wave packets. We also present the advantages of this proposal over previous approaches.
University of Calgary  Presentation  20110616  H. Kaviani, B. He, A. MacRae, W. Jiang, A. Lvovsky, C. Simon  Detuningchange Quantum memory University of Calgary  Presentation  20120611  H. Kaviani, M. Khazali, K. Heshami, C. Simon  Detuningchange Quantum memory University of Calgary  Presentation  20120725  H. Kaviani, M. Khazali, K. Heshami, C. Simon  Nonlinear optomechanical paddle nanocavities University of Calgary  Publication  20150301  H. Kaviani, C. Healey, M. Wu, R. Ghobadi, A. Hryciw, P. E. Barclay  Polaritonic quantum memory with twolevel systemsGenerating efficient quantum memories is crucial for the future Information processing. One of the wellknown methods for describing quantum memories and analyzing the nature of coupling between light and matter is Polariton model. We analyze a light storage protocol based on cavity arrays [1] in terms of twolevel polaritons, which is different from the typical EIT polaritons [2]. The cavity array scheme moreover inspires us to propose a quantum memory scheme with atomic ensembles. The scheme [1] is based on two types of cavities, waveguide and side cavities. The coupled system possesses two eigenstates (polaritons) corresponding to two different group velocities. One can launch the incoming light into one of these polaritons and changes its group velocity by adiabatic modulation of the detuning between sidecavities and waveguidecavities. In principle, this allows us to reduce the group velocity to zero, while the adiabaticity guarantees that the eigenstates (polaritons) remain separated during the process. Based on the cavity array model, we introduce an ideal and reversible transfer technique for the quantum state between light and two level atoms. The method is based on the control of photon propagation in the medium, in which the group velocity could be manipulated by the detuning and adiabatically reduced to zero. We present a detailed analysis for this model based on polaritonic description. [1] M. F. Yanik, S. Fan, Physical Review Letters, 92, (2004). [2] M. Fleischhauer, M. D. Lukin, Phys. Rev. Lett. 84, 5094. (2000). University of Calgary  Presentation  20120612  M. Khazali, C. Simon, H. Kaviani, R. Ghobadi, K. Heshami  Single crystal diamond nanobeam waveguide optomechanics University of Calgary  Publication  20151229  B. Khanaliloo, H. Jayakumar, A. C. Hryciw, D. P. Lake, H. Kaviani, P. E. Barclay 

