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Quantum hybrid systems with superconducting circuits

Quantum hybrid systems is a popular modern research field where scientist try to combine quantum systems of different architectures. Superconducting circuits thanks to their strong non-linearities and advance quantum control can be a valuable resource to extend functionality of many other quantum devices. On the other hand superconducting circuits lack the coherence times of their spin and atomic quantum counterparts.

Different systems can be incorporated into superconducting circuits to achieve a particular goal. For example, coupling supercondcuting circuits to a nanomechnical oscillator was the most successful approach to cool down the mechanical degree of freedom to its ground state. There have also been a number of successful experiments where strong couling regime between superconducting resonator or a qubit with an ensemble of spins were achieved opening a path to realize a superconducting quantum processor with a spin-based quantum memory.

As part of EQuS Centre our team has a unique opportunity to get in touch with Australian leading researchersworking on other quantum systems. We are currenly collaborating with Prof. Michael Tobar on coupling a superconducting qubit to a macroscopic acoustic cavity.

The ARC Centre of Excellence for Engineered Quantum Systems

This Centre of Excellence seeks to initiate the Quantum Era in the 21st century by engineering designer quantum systems.

Jerger M. et al, 2016
Nature Communications, 7, pp. 12930

Contextuality is one of the most fundamental properties of quantum mechanics, distinguishing it from classical physics without a need for nonlocality or entanglement. It is also a critical resource for exponential speedup in universal surface-code quantum computing. Our result is the first experiment violating a noncontextuality inequality with an indivisible system where entanglement cannot be defined which also addresses all known major loopholes, such as the detection, compatibility and individual-existence loopholes. Violating noncontextuality with superconducting circuits, a leading candidate for implementing surface-code quantum computing, comprises an important conceptual milestone in demonstrating their suitability for quantum technological applications.

We discuss a similarity between resonant oscillations in two nonlinear systems; namely, a chain 
of coupled Duffing oscillators and a bilayer fish-scale metamaterial. In such systems two

Macha Pascal et al, 2014
Nature Communications, 5, pp. 5146

Implementation of a quantum metamaterial using superconducting qubits