Single Qubit Manipulation in Heteronuclear Diatomic Molecular System

Abstract

We propose a scenario to realize quantum computers utilizing heteronuclear diatomic rovibrational states as qubits. We focused on rovibrational qubits created by simple transform limited infrared laser pulse instead of using chirped pulse. Numerical calculations show that single qubit gate operation in the electronic ground state of LiH molecule can be obtained. We also discuss the effect of temperature on the initially rotational states, and a suitable experiment condition is indicated.

Effect of laser pulse shaping parameters on the fidelity of quantum logic gates

“…The majority of theoretical studies within diatomic quantum computing, using shaped laser pulses, produce excellent qubit control but with laser pulses that are difficult, or perhaps impossible, to realize experimentally and/or only show proof of principle applications on a particular choice of diatomic molecule. [15][16][17][18][19][20][21][22][23][24][25][26][27][28][29][30] In contrast, we previously studied the performance of shaped laser pulses on a general model diatomic 31 and the ability to achieve high control with laser pulses having very few parameters (binary pulse shaping). 32 The theoretical optimizing or shaping of laser pulses generally comes in two forms: optimal control theory (OCT) 33,34 and genetic algorithm (GA) 11 optimization.…”