Shot noise in an electron waveguide square root of NOT gate

Details Shot noise in an electron waveguide square root of NOT gate Shot noise in an electron waveguide square root of NOT gate

2006-01-17

arxiv.org/abs/quant-ph/0601113v1

Physics

Quantum Physics

10 pages, 5 figures

Scientific paper

10.1103/PhysRevA.74.012318

We present a calculation of the shot noise in a ballistic electron waveguide square root of NOT gate. A general expression for the shot noise in the leads connected to these types of gates is shown. We then parameterize an S-matrix which qualitatively describes the action of a square root of NOT gate previously found through numerical methods for GaAs/Al_xGa_{1-x}As based waveguides systems. Using this S-matrix, the shot noise in a single output lead and across two output leads is calculated. We find that the measurement of the shot noise across two output leads allows for the determination of the fidelity of the gate itself.

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