Relative multiplexing for minimising switching in linear-optical quantum computing
Mercedes Gimeno-Segovia
(Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol , BS8 1FD, United Kingdom; Institute for Quantum Science and Technology, University of Calgary , Alberta T2N 1N4, Canada)
Hugo Cable
(Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol , BS8 1FD, United Kingdom)
Gabriel J Mendoza
(Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol , BS8 1FD, United Kingdom)
Pete Shadbolt
(Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom)
Joshua W Silverstone
(Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol , BS8 1FD, United Kingdom)
Jacques Carolan
(Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA 02139, United States of America)
Mark G Thompson
(Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol , BS8 1FD, United Kingdom)
Jeremy L O’Brien
(Quantum Engineering Technology Labs, H. H. Wills Physics Laboratory and Department of Electrical and Electronic Engineering, University of Bristol , BS8 1FD, United Kingdom)
Terry Rudolph
(Department of Physics, Imperial College London, London SW7 2AZ, United Kingdom)
Journal: New Journal of Physics
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• IOP Publishing
• ISSN: 1367-2630
Abstract
Many existing schemes for linear-optical quantum computing (LOQC) depend on multiplexing (MUX), which uses dynamic routing to enable near-deterministic gates and sources to be constructed using heralded, probabilistic primitives. MUXing accounts for the overwhelming majority of active switching demands in current LOQC architectures. In this manuscript we introduce relative multiplexing (RMUX), a general-purpose optimisation which can dramatically reduce the active switching requirements for MUX in LOQC, and thereby reduce hardware complexity and energy consumption, as well as relaxing demands on performance for various photonic components. We discuss the application of RMUX to the generation of entangled states from probabilistic single-photon sources, and argue that an order of magnitude improvement in the rate of generation of Bell states can be achieved. In addition, we apply RMUX to the proposal for percolation of a 3D cluster state by Gimeno-Segovia et al (2015 Phys. Rev. Lett. 115 020502), and we find that RMUX allows an 2.4× increase in loss tolerance for this architecture.
Mercedes Gimeno-Segovia, Hugo Cable, Gabriel J Mendoza, et al. (2017). "Relative multiplexing for minimising switching in linear-optical quantum computing". New Journal of Physics. https://doi.org/10.1088/1367-2630/aa7095