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Multimode circuit quantum electrodynamics

Superconducting qubits are one of the leading technologies for making a quantum computer. In addition, their strong interaction with microwave photons makes them an ideal platform for studying quantum optics with artificial matter. Inspired by the recent progress in the field of metamaterials in the optical domain, we have developed highly multimode electromagnetic structures and explore them for engineering light /matter interactions in the GHz regime.

New platforms for quantum hardware

Beyond the number of qubits, a primary challenge towards large scale implementation of quantum algorithms is the gate fidelity of the sub-components, which ultimately limits the attainable circuit depths (read more about quantum volume metric from the IBM group). We are interested in developing new hardware for quantum information processing tasks. On this front, our efforts focus on making hybrid integrated devices for entangling photons and phonons with superconducting qubits to combine memory and logic elements on the chip scale. We also explore new methods for understanding the sources of loss in superconducting qubits, which ultimately can lead to better designs and new material systems for making qubits with the state-of-the-art gate fidelities.

Quantum frequency conversion

Despite the rapid progress in coherence and system complexity of superconducting quantum devices in the past decides, these systems to date lack a mechanism for long-haul information transfer, which has limited their operation environments to small (meter) scales and cold (milli-Kelvin) temperatures. We pursuit methods of entangling distant qubits by means of upconverting microwave quantum signals to higher frequencies (from GHz all the way to THz and optical frequencies), where the effects of thermal environment is less severe.

Distributed quantum computing

Increasing system complexity while maintaining control over the constituent parts is a major challenge for scaling quantum computers. Quantum networks propose a modular approach to this end, where small and mid-sized units with memory and processing capabilities are linked together via high fidelity quantum interconnects (learn more about increasing capacity of quantum links). We explores means of distributing entanglement over long distance via optical photons by working toward realizing quantum repeaters.