Linear Optical Logical Bell State Measurements with Optimal Loss-Tolerance Threshold
PRX Quantum, vol. 4
Abstract
Quantum threshold theorems impose hard limits on the hardware capabilities to process quantum information.We derive tight and fundamental upper bounds to loss-tolerance thresholds in different linearoptical quantum information processing settings through an adversarial framework, taking into account the intrinsically probabilistic nature of linear optical Bell measurements.For logical Bell state measurements-ubiquitous operations in photonic quantum information-we demonstrate analytically that linear optics can achieve the fundamental loss threshold imposed by the no-cloning theorem even though, following the work of Lee et al. [Phys.Rev. A 100, 052303 (2019)] the constraint was widely assumed to be stricter.We spotlight the assumptions of the latter publication and find their bound holds for a logical Bell measurement built from adaptive physical linear-optical Bell measurements.We also give an explicit even stricter bound for nonadaptive Bell measurements.
Authors 5
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Leiden University · Quandela (France)
Affiliation as printed
Huygens-Kamerlingh Onnes Laboratory, Leiden University, P.O. Box 9504, Leiden, RA 2300, Netherlands
Quandela, 7 Rue Léonard de Vinci, Massy 91300, France
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Centre National de la Recherche Scientifique · Sorbonne Université · LIP6
Affiliation as printed
Sorbonne Université, CNRS, LIP6, Paris F-75005, France
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Affiliation as printed
Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
Virginia Tech Center for Quantum Information Information Science and Engineering, Blacksburg, Virginia 24601, USA
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Affiliation as printed
Department of Physics, Virginia Tech, Blacksburg, Virginia 24061, USA
Virginia Tech Center for Quantum Information Information Science and Engineering, Blacksburg, Virginia 24601, USA
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Centre National de la Recherche Scientifique · Sorbonne Université · LIP6
Affiliation as printed
Sorbonne Université, CNRS, LIP6, Paris F-75005, France
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