Quantum circuit simulation is the first with frequency-domain flux quantisation

Keysight Technologies, Inc. has introduced Quantum Circuit Simulation (Quantum Ckt Sim), an innovative circuit design environment that speeds up the development of intricate quantum circuits. In addition, by joining forces with Google Quantum AI, the solution includes advanced flux quantisation, marking an industry-first achievement.

Accurately modelling flux quantisation is essential in the realm of superconducting quantum circuits. This fundamental property ensures that the magnetic flux through a superconducting loop is quantised in discrete units, a critical aspect for the operation of quantum circuits. The companies have collaborated to address this challenge and improve quantum circuit simulations by integrating frequency-domain flux quantisation into circuit solvers. The new solution allows researchers to design more reliable and efficient superconducting circuits by precisely modelling flux quantisation.

The collaboration's success is detailed in a recently posted technical paper titled "Modelling flux-quantising Josephson junction circuits in Keysight ADS". This paper demonstrates the innovative approach to flux-quantisation and its significant impact on the field of quantum computing. The success sets a new standard for the accuracy and efficiency of modelling superconducting circuits.

The new solution streamlines quantum workflow with advanced flux quantisation in the frequency domain, providing unparalleled accuracy and capability in analysing large, highly nonlinear quantum circuits. This enables researchers to model complex quantum circuits with better accuracy, reducing computational errors and enhancing the overall reliability of simulations.

Ofer Naaman, research scientist, Google Quantum AI, said: "Using Quantum Ckt Sim, it is now possible to enforce flux quantisation conditions in ADS frequency-domain simulations of superconducting devices. This is a critical capability whose absence thus far limited the usability of modern EDA tools in microwave superconducting circuit design."

Mohamed Hassan, Quantum Solutions planning lead, Keysight EDA, said: "It's thrilling to witness the accurate modelling of frequency domain flux quantisation of superconducting circuits using an EDA tool for the first time. This significant milestone leverages EDA capabilities to streamline the design of superconducting microwave circuits for quantum applications and beyond. We anticipate this advancement will empower quantum engineers to enhance the performance of parametric quantum circuits, particularly in terms of power handling and bandwidth, which are crucial for the readout of qubits in quantum computers."