EPJ D - Speedier Quantum Logic

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Published on 16 May 2011

Quantum information processing requires logical operations with multiple quantum bits. One route to this goal is controlling each qubit with a time-dependent external magnetic field. In this recent paper published in EPJ D, Heule et al. describe ways to perform logical operations on an ENTIRE superconducting qubit chain by controlling just ONE of the end qubits of the chain.

Strikingly, the authors show that certain operations - e.g., flipping the state of the last qubit in the chain - can be done faster by acting on the first qubit with a magnetic field in the x-direction only, rather than with fields in both x- and y-directions. These faster techniques can speed up logical operations. This paper thus paves the way for faster quantum logic with superconducting qubits.