Fusion-based quantum computation

Sara Bartolucci, Patrick Birchall, Hector Bombín, Hugo Cable, Chris Dawson, Mercedes Gimeno-Segovia, Eric Johnston, Konrad Kieling, Naomi Nickerson (), Mihir Pant (), Fernando Pastawski, Terry Rudolph and Chris Sparrow
Additional contact information
Sara Bartolucci: PsiQuantum
Patrick Birchall: PsiQuantum
Hector Bombín: PsiQuantum
Hugo Cable: PsiQuantum
Chris Dawson: PsiQuantum
Mercedes Gimeno-Segovia: PsiQuantum
Eric Johnston: PsiQuantum
Konrad Kieling: PsiQuantum
Naomi Nickerson: PsiQuantum
Mihir Pant: PsiQuantum
Fernando Pastawski: PsiQuantum
Terry Rudolph: PsiQuantum
Chris Sparrow: PsiQuantum

Nature Communications, 2023, vol. 14, issue 1, 1-9

Abstract: Abstract The standard primitives of quantum computing include deterministic unitary entangling gates, which are not natural operations in many systems including photonics. Here, we present fusion-based quantum computation, a model for fault tolerant quantum computing constructed from physical primitives readily accessible in photonic systems. These are entangling measurements, called fusions, which are performed on the qubits of small constant sized entangled resource states. Probabilistic photonic gates as well as errors are directly dealt with by the quantum error correction protocol. We show that this computational model can achieve a higher threshold than schemes reported in literature. We present a ballistic scheme which can tolerate a 10.4% probability of suffering photon loss in each fusion, which corresponds to a 2.7% probability of loss of each individual photon. The architecture is also highly modular and has reduced classical processing requirements compared to previous photonic quantum computing architectures.

Date: 2023
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DOI: 10.1038/s41467-023-36493-1

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