ProSQu

Quantum computers (QC) hold the promise to revolutionize various fields with their extraordinary processing power. However, several technological obstacles must be surpassed to fully unlock this potential. A primary milestone is achieving quantum advantage, the point where quantum computers can solve certain problems more efficiently or quicker than classical computers. This necessitates an increase in the number of high-fidelity qubits, the fundamental units of quantum information. However, the scaling-up of qubits is challenging due to their immense sensitivity to environmental noise, and a propensity for errors, making the stability of larger systems difficult. 

Currently, we lack the technological capability to create a large-scale, error-resistant quantum system, thereby inhibiting quantum computers from reaching their full potential and achieving quantum advantage. Our research in the ProSQu project aims to develop a signaling module for qubits that protects them from noise, enables qubit control with low drive power, minimizes cryostat heating, and reduces noise interference. We are developing well-thermalized filters and attenuators to prevent heat generation during qubit manipulation. Leveraging our recent invention, we will implement a tunable microfilter designed to protect qubits from noise. 

In our roadmap, we will replace bulky coaxial cables with flexible cables to create a more compact setup within the cryostat. Furthermore, we plan to multiplex signals to control multiple qubits using a single line, rather than individual lines for each qubit as is currently done. Thus ProSQu offers a pragmatic solution for qubit control essential for a scaled-up quantum processor. We envision a significant reduction in cryostat heat load, potentially enabling a quantum leap from current 1000 qubits to millions, essential for attaining quantum advantage through fault tolerance.