2004/10/31 by Philip Walther, Anton Zeilinger · 1 citation
Computer Science · Engineering · Mathematics · Physics and Astronomy · #Bell state #Computer science #Electronic engineering #Engineering #Mathematics #Optics #Photonics #Physics #Quantum #Quantum Computing Algorithms and Architecture #Quantum Information and Cryptography #Quantum Mechanics and Applications #Quantum computer #Quantum gate #Quantum mechanics #Quantum network #Quantum teleportation #Qubit #Realization (probability) #Spectrum analyzer #Superdense coding #quant-ph
paper · pdf · doi:10.1103/physreva.72.010302
published as Physical Review A 72 010302(R) (2005) · 4 pages, 4 figures
openalex publication_date 2005/07/14 · arxiv created 2005/07/19 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
Efficient teleportation is a crucial step for quantum computation and quantum networking. In the case of qubits, four different entangled Bell states have to be distinguished. We have realized a probabilistic, but in principle deterministic, Bell-state analyzer for two photonic quantum bits by the use of a nondestructive controlled-NOT gate based on entirely linear optical elements. This gate was capable of distinguishing between all of the Bell states with higher than 75% fidelity without any noise substraction due to utilizing quantum interference effects.