Relative multiplexing for minimising switching in linear-optical quantum computing

Mercedes Gimeno-Segovia, Hugo Cable, Gabriel Mendoza, Peter Shadbolt, Josh Silverstone, Jacques Carolan, Mark Thompson, Jeremy O'Brien, Terry Rudolph

Research output: Contribution to journalArticle (Academic Journal)peer-review

28 Citations (Scopus)
342 Downloads (Pure)


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 in [PRL 115, 020502 (2015)], and we find that RMUX allows an 2.4x increase in loss tolerance for this architecture.
Original languageEnglish
Article number063013
Number of pages13
JournalNew Journal of Physics
Publication statusPublished - 6 Jun 2017

Structured keywords

  • Bristol Quantum Information Institute
  • QETLabs
  • Photonics and Quantum


  • Linear-optical quantum computing


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