Atomic Interferometer Gates Realization via Quantum Optimal Control

TL;DR

This paper develops a quantum optimal control method to realize high-fidelity atomic interferometer gates, crucial for quantum sensing applications like gravimetry and gyroscopy.

Contribution

It introduces a pulse-based stochastic gradient descent algorithm optimizing atomic mirror and beam-splitter gates with fidelity above 0.995.

Findings

Achieved gate fidelities of 0.995 and 0.998 for mirror and beam-splitter gates.

Utilized numerical optimal control with a defined cost function based on unitary distance.

Applied to two-level atomic clock transitions.

Abstract

Atomic Interferometer has two quantum unitary gates that must be realized for quantum sensing purposes from atomic gravimeter and atomic interferometer gyroscope. An optimal cost function which define the distance between two unitary operator is defines and based on it a pulse based stochastic gradient descent algorithm is derived for implementation of atomic mirror and atomic beam-splitter gates. By using numerical optimal control for those gate realization, we achieved to gate fidelity of 0.995 and 0.998 for mirror and beam-splitter gates, respectively. For this research, a two-level atomic clock transitions are employed.