One-photon measurement of two-photon entanglement
arXiv:2009.02851 · doi:10.1103/PhysRevLett.130.090202
Abstract
Entanglement is a fundamental feature of quantum mechanics, considered a key resource in quantum information processing. Measuring entanglement is an essential step in a wide range of applied and foundational quantum experiments. When a two-particle quantum state is not pure, standard methods to measure the entanglement require detection of both particles. We introduce a method in which detection of only one of the particles is required to characterize the entanglement of a two-particle mixed state. Our method is based on the principle of quantum interference. We use two identical sources of a two-photon mixed state and generate a set of single-photon interference patterns. The entanglement of the two-photon quantum state is characterized by the visibility of the interference patterns. Our experiment thus opens up a distinct avenue for verifying and measuring entanglement, and can allow for mixed state entanglement characterization even when one particle in the pair cannot be detected.
arXiv comment4 pages plus supplementary material. See also "Characterizing mixed state entanglement through single-photon interference" (Mayukh Lahiri et. al.) for related theory
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- Experimental quantum imaging distillation with undetected light
- Measuring the Evolution of Entanglement in Compton Scattering
- Single-qubit measurement of two-qubit entanglement in generalized Werner states
- Violation of Bell Inequality with Unentangled Photons
- Quantum state tomography of undetected photons
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- Metrological Advantages in Seeded and Lossy Nonlinear Interferometers