# Rapid adiabatic gating for capacitively coupled quantum dot hybrid qubits without barrier control

## TL;DR

This paper proposes a rapid, adiabatic gating method for capacitively coupled quantum dot hybrid qubits that achieves high-fidelity entanglement without barrier control, using shaped detuning pulses in about 50 nanoseconds.

## Contribution

It introduces a new adiabatic gating technique that enables fast, high-fidelity entangling operations in quantum dot hybrid qubits without adjusting tunnel couplings.

## Key findings

- Achieves two-qubit entangling gates in ~50 ns.
- Fidelity exceeds 90% under realistic charge noise conditions.
- Operates without simultaneous tunnel coupling adjustments.

## Abstract

We theoretically examine the capacitive coupling between two quantum dot hybrid qubits, each consisting of three electrons in a double quantum dot, as a function of the energy detuning of the double dot potentials. We show that a shaped detuning pulse can produce a two-qubit maximally entangling operation in $\sim$50ns without having to simultaneously change tunnel couplings. Simulations of the entangling operation in the presence of experimentally realistic charge noise yield two-qubit fidelities over 90%.