uri physics colloquium

Encoded qubit approach to superconducting quantum computing

Yun-Pil Shim, PhD, University of Maryland

Wednesday, January 22, 2020

4 pm, East Hall Room 112

abstract

Superconducting qubits based on Josephson junction circuits have progressed rapidly over the past two decades. Superconducting circuit quantum information technology is an attractive platform for quantum computing due to lithographic scalability, and high fidelity local control and readout. Going from the laboratory setups to commercialization requires a strategy for an architecture accommodating much larger number of qubits while maintaining the capability of individual controls. In this talk, I will give a short introduction to quantum computing and superconducting qubits, and then present an encoded qubit (EQ) scheme for superconducting qubits, encoding a qubit in a pair of physical superconducting qubits. All logical gate operations on EQs can be implemented by tuning the qubit frequencies of the individual superconducting qubits using only the baseband control, obviating the need for expensive state-of-the-art microwave equipment for individual qubit operations. Furthermore, the EQ is 1st-order insensitive to most, if not all, noise channels that are present in its environment. A realization of this approach in collaboration with experimentalists will be presented, showing good coherence and high gate fidelities comparable to other conventional superconducting qubit schemes.