In-line detection and reconstruction of multi-photon quantum states
arXiv:1808.05038 · doi:10.1364/OPTICA.6.000041
Abstract
Integrated single-photon detectors open new possibilities for monitoring inside quantum photonic circuits. We present a concept for the in-line measurement of spatially-encoded multi-photon quantum states, while keeping the transmitted ones undisturbed. We theoretically establish that by recording photon correlations from optimally positioned detectors on top of coupled waveguides with detuned propagation constants, one can perform robust reconstruction of the density matrix describing the amplitude, phase, coherence and quantum entanglement. We report proof-of-principle experiments using classical light, which emulates single-photon regime. Our method opens a pathway towards practical and fast in-line quantum measurements for diverse applications in quantum photonics.
arXiv comment5 pages, 4 figures
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- Equivalence of reflection paths of light and Feynman paths in stacked metasurfaces
- Demonstration of Lossy Linear Transformations and Two-Photon Interference on a Photonic Chip
- Complex structure and characterization of multi-photon split states in integrated circuits