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Coupled Cavity Array for Quantum System Control
April 17, 2025
An EPFL report:
Quantum bits, or qubits, are versatile components that play a crucial role in quantum computing and analog quantum simulation. While quantum computing is well-known for its potential to revolutionize information processing, analog quantum simulation involves using a well-controlled quantum system to mimic the behavior of a more complex system. Analog quantum simulation can be more efficient than digital computer simulation, offering a simpler and more direct approach to studying complex phenomena.
Central to the success of both digital quantum computing and analog quantum simulation is the ability to manipulate the environment in which qubits operate. One powerful tool for achieving this control is a coupled cavity array (CCA), a structure composed of interconnected microwave cavities arranged in a specific pattern. These CCAs enable precise interactions between qubits and their surroundings, opening up new possibilities for designing and manipulating quantum systems.
Similar to how electrons in crystals can exhibit unique properties that influence the flow of electricity, CCAs can control the propagation of light at specific wavelengths. By carefully engineering the geometry of the cavities within the array, scientists can selectively allow certain wavelengths of light to pass through while blocking others. This ability to tailor the behavior of photons within the CCA is essential for creating advanced quantum devices and systems.
A team of researchers at EPFL, led by Prof. Pasquale Scarlino from the Hybrid Quantum Circuits Laboratory, in collaboration with Dr. Marco Scigliuzzo from the Laboratory of Photonics and Quantum Measurements at EPFL, and Prof. Oded Zilberberg from the University of Konstanz, has developed a novel CCA design using niobium nitride (NbN), a superconductor known for its high kinetic inductance. This innovative approach leverages the unique properties of NbN to create a highly efficient and controllable platform for quantum experiments and applications.
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