Coherent controlization using superconducting qubits

TL;DR

This paper proposes a scheme for implementing coherent controlization in superconducting qubits, enabling flexible quantum algorithms, especially useful for adaptive decision-making in quantum learning agents.

Contribution

It introduces a scalable method for coherent controlization in superconducting qubits, with explicit constructions for two and three qubits, considering realistic experimental effects.

Findings

Feasible implementation of controlization with superconducting qubits.

Explicit two- and three-qubit control schemes demonstrated.

Analysis includes effects of loss, dephasing, and cavity self-Kerr.

Abstract

Coherent controlization, i.e., coherent conditioning of arbitrary single- or multi-qubit operations on the state of one or more control qubits, is an important ingredient for the flexible implementation of many algorithms in quantum computation. This is of particular significance when certain subroutines are changing over time or when they are frequently modified, such as in decision-making algorithms for learning agents. We propose a scheme to realize coherent controlization for any number of superconducting qubits coupled to a microwave resonator. For two and three qubits, we present an explicit construction that is of high relevance for quantum learning agents. We demonstrate the feasibility of our proposal, taking into account loss, dephasing, and the cavity self-Kerr effect.