Quantum gate identification: Error analysis, numerical results and optical experiment

Quantum gate identification: error analysis, numerical results and optical experiment

The identification of an unknown quantum gate is a significant issue in quantum technology. In this paper, we propose a quantum gate identification method within the framework of quantum process tomography. In this method, a series of pure states are inputted to the gate and then a fast state tomography on the output states is performed and the data are used to reconstruct the quantum gate. Our...

Quantum optical Fredkin gate.

Quantum gate control mechanism identification

Chakrabarti Group (J. Quantum Information) Abstract Quantum gates are usually executed by gate decomposition strategies that apply specifically designed Hamiltonians sequentially to generate the desired overall time evolution. However, the desired time evolution can also be achieved via optimal control methods, wherein shaped electromagnetic fields generate motion in the directions necessary to...

Numerical Analysis of Gate Stacks

Numerous technological innovations, including material and process changes such as high–k gate dielectrics and metal gate electrodes, are investigated to meet the upcoming scaling requirements while keeping the gate leakage current within tolerable limits [1]. To overcome the technological problems, further theoretical and experimental research is needed which requires an extensive use of compu...

Generalized Numerical Ranges and Quantum Error Correction

For a noisy quantum channel, a quantum error correcting code of dimension k exists if and only if the joint rank-k numerical range associated with the error operators of the channel is non-empty. In this paper, geometric properties of the joint rank k-numerical range are obtained and their implications to quantum computing are discussed. It is shown that for a given k if the dimension of the un...