22 January 2010 Coupled plasmonic quantum bits
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Abstract
In this paper we introduce a coupled system of two quantum bits residing at the interface of a heterostructure device. The structure encompasses a reference quantum bit, a photonic/plasmonic crystal waveguide and an obedient quantum bit. Each quantum bit is an electronic device which is designed based on an anti-dot lattice of two-dimensional electron gas in heterostructures. By applying a potential gate in the aforementioned structure it is possible to control electronic tunneling rate and hence quantum bits' swapping frequency. Coupling through the plasmonic waveguide may be employed to entangle quantum bits. The waveguide has been designed by exploiting conducting islands of two-dimensional electron gas in a host of layered semiconductor heterostructure, behaving effectively as a patterned metallic thin film. The plasmonic characteristic is here modeled by Drude dispersion which obviates the required frequency dependency of our case. Employment of a plasmonic crystal waveguide benefited from plasmonic nature instead of regular dielectrics decreases the dimensions ten-fold, which helps the structure's size to come within the range of practical fabrication technologies. In order to estimate the evolution of the entangled state of the pair of quantum bits, it is necessary to estimate the coupling coefficient between electronic and optical subsystems. This parameter can be regarded as a design goal of matched electronic and optical structures, and has been discussed in detail for the optimization purposes. In the present work, both plasmonic and electronic properties are investigated. For simulating different sections, revised guided mode expansion (RGME) and finite difference time domain (FDTD) methods are employed.
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Amin Eftekharian, Amin Eftekharian, Majid Sodagar, Majid Sodagar, Milad Khoshnegar, Milad Khoshnegar, Sina Khorasani, Sina Khorasani, Ali Adibi, Ali Adibi, } "Coupled plasmonic quantum bits", Proc. SPIE 7608, Quantum Sensing and Nanophotonic Devices VII, 76080M (22 January 2010); doi: 10.1117/12.840094; https://doi.org/10.1117/12.840094
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