Affiliation:
1. Laboratoire Kastler Brossel
2. Sorbonne Université
3. The University of Tokyo
4. Welinq
5. RIKEN Center for Quantum Computing
Abstract
Optical quantum information processing relies critically on Bell-state measurement, a ubiquitous operation for quantum communication and computing. Its practical realization involves the interference of optical modes and the detection of a single photon in an indistinguishable manner. Yet, in the absence of efficient photon-number-resolution capabilities, errors arise from multiphoton components, decreasing the overall process fidelity. Here, we introduce a hybrid detection scheme for Bell-state measurement, leveraging both on-off single-photon detection and quadrature conditioning via homodyne detection. We derive explicit fidelities for quantum teleportation and entanglement-swapping processes employing this strategy, demonstrating its efficacy. We also compare with photon-number-resolving detectors and find a strong advantage of the hybrid scheme in a wide range of parameters. This work provides a new tool for linear-optics schemes, with applications to quantum state engineering and quantum interconnects.
Published by the American Physical Society
2024
Funder
Japan Science and Technology (JST) Agency
University of Tokyo
ShoQC Quantera
France 2030
QIA-Phase 1
University of Tokyo Foundation
Forefront Physics and Mathematics Program to Drive Transformation
Leadership Development Program for Ph.D.
Publisher
American Physical Society (APS)