Breakthrough in quantum computing unlocks precise qubit interaction control
A team of researchers has made significant strides in understanding and controlling interactions between two transmon qubits, a crucial step in quantum computing. Their work, published in a leading physics journal, details a comprehensive characterisation of the system and demonstrates precise tuning of interactions between the qubits.
The team achieved control over distinct interaction regimes, including photon hopping, two-mode squeezing, and cross-Kerr interactions. They developed a method to precisely tune these interactions by parametrically modulating the system. This allowed them to determine the strength of interactions between the qubits, including hopping, squeezing effects, and the cross-Kerr effect.
To extract key parameters, the researchers compared experimental data with simulations based on their theoretical model. They accounted for individual qubit frequencies, nonlinearities, and coupling terms. Precise control of magnetic flux enabled them to manipulate energy exchange and coherence properties between the oscillators. The team investigated how external magnetic flux could modulate the interaction strength between two strongly coupled nonlinear oscillators, achieving this through spectroscopic measurements and detailed analysis of the system's response to applied signals.
The team's work not only advances our understanding of strongly coupled nonlinear oscillators but also paves the way for exploring complex spin systems and previously inaccessible dynamics in quantum computing. Their theoretical framework enables further exploration of these systems, with potential applications in quantum information processing and other quantum technologies.
