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Relaxation to Negative Temperatures in Double Domain Systems
Yusuke Hama, William J. Munro, Kae Nemoto
We investigate the relaxation of two collective spins in double domain system, which are individually coupled to a single bosonic reservoir, by varying the total number of spins in…
Repeaters for Continuous Variable Quantum Communication
Fabian Furrer, William J. Munro
Optical telecommunication is at the heart of today's internet and is currently enabled by the transmission of intense optical signals between remote locations. As we look to the fu…
Quantum metrology including state preparation and readout times
Shane Dooley, William J. Munro, Kae Nemoto
There is growing belief that the next decade will see the emergence of sensing devices based on the laws of quantum physics that outperform some of our current sensing devices. For…
Observation of collective coupling between an engineered ensemble of macroscopic artificial atoms and a superconducting resonator
Kosuke Kakuyanagi, Yuichiro Matsuzaki, Corentin Deprez +5
The hybridization of distinct quantum systems is now seen as an effective way to engineer the properties of an entire system leading to applications in quantum metamaterials, quant…
An efficient and compact quantum switch for quantum circuits
Yulin Wu, Li-Ping Yang, Yarui Zheng +11
The engineering of quantum devices has reached the stage where we now have small scale quantum processors containing multiple interacting qubits within them. Simple quantum circuit…
Some implications of superconducting quantum interference to the application of master equations in engineering quantum technologies
S. N. A. Duffus, K. N. Bjergstrøm, V. M. Dwyer +6
In this paper we consider the modelling and simulation of open quantum systems from a device engineering perspective. We derive master equations at different levels of approximatio…
Leggett--Garg inequality violations with a large ensemble of qubits
Neill Lambert, Kamanasish Debnath, Anton Frisk Kockum +3
We investigate how discrete internal degrees of freedom in a quasi-macroscopic system affect the violation of the Leggett--Garg inequality, a test of macroscopic-realism based on t…
Measurement-device-independent quantum key distribution with nitrogen vacancy centers in diamond
Nicoló Lo Piparo, Mohsen Razavi, William J. Munro
Memory-assisted measurement-device-independent quantum key distribution (MA-MDI-QKD) has recently been proposed as a possible intermediate step towards the realization of quantum r…
Wigner Functions for Arbitrary Quantum Systems
Todd Tilma, Mark J. Everitt, John H. Samson +2
The possibility of constructing a complete, continuous Wigner function for any quantum system has been a subject of investigation for over 50 years. A key system that has served to…