Implementation of Quantum Logic Gates Using Polar Molecules in Pendular States

TL;DR

This paper proposes a method to implement quantum logic gates using polar molecules in pendular states, employing optimal control theory to achieve high-fidelity operations suitable for quantum computing.

Contribution

It introduces a systematic approach combining pendular states and optimal control theory for implementing quantum gates on polar molecules.

Findings

High-fidelity realization of NOT, Hadamard, and CNOT gates.

Detailed calculations for SrO molecules as qubits.

Use of laser fields optimized via MTOCT for gate operations.

Abstract

We present a systematic approach to implementation of basic quantum logic gates operating on polar molecules in pendular states as qubits for a quantum computer. A static electric field prevents quenching of the dipole moments by rotation, thereby creating the pendular states; also, the field gradient enables distinguishing among qubit sites. Multi-Target Optimal Control Theory (MTOCT) is used as a means of optimizing the initial-to-target transition probability via a laser field. We give detailed calculations for the SrO molecule, a favorite candidate for proposed quantum computers. Our simulation results indicate that NOT, Hadamard and CNOT gates can be realized with high fidelity for such pendular qubit states.