Multiplication of Qubits in a Doubly Resonant Bichromatic Field

TL;DR

This paper explores how spin qubits can be multiplied through double resonance in a bichromatic field, emphasizing the control of multiphoton transitions and the importance of the counter-rotating component for precise operations.

Contribution

It introduces a method to select multiphoton transitions of dressed qubits by choosing the rotating frame and rf phase, accounting for the counter-rotating component in strong fields.

Findings

Operational multiphoton transitions can be controlled via frame and phase choices.

Counter-rotating component significantly affects qubit operation accuracy.

Enhanced precision in dressed qubit operations in strong-field regimes.

Abstract

Multiplication of spin qubits arises at double resonance in a bichromatic field when the frequency of the radio-frequency (rf) field is close to that of the Rabi oscillation in the microwave field, provided its frequency equals the Larmor frequency of the initial qubit. We show that the operational multiphoton transitions of dressed qubits can be selected by the choice of both the rotating frame and the rf phase. In order to enhance the precision of dressed qubit operations in the strong-field regime, the counter-rotating component of the rf field is taken into account.