Two-photon tomography using on-chip quantum walks

Abstract

We present a conceptual approach to quantum tomography based on first expanding a quantum state across extra degrees of freedom and then exploiting the introduced sparsity to perform reconstruction. We formulate its application to photonic circuits, and show that measured spatial photon correlations at the output of a specially tailored discrete-continuous quantum-walk can enable full reconstruction of any two-photon spatially entangled and mixed state at the input. This approach does not require any tunable elements, so is well suited for integration with on-chip superconducting photon detectors.

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• Quantum walks of correlated particles
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• Optimal Frames for Polarisation State Reconstruction
• Astrointerferometry with discrete optics

Cited by in corpus (12)

• Quantum metasurface for multi-photon interference and state reconstruction
• Scalable on-chip quantum state tomography
• Review on Quantum Walk Computing: Theory, Implementation, and Application
• Dynamic-Disorder-Induced Enhancement of Entanglement in Photonic Quantum Walks
• Multiphoton Tomography with Linear Optics and Photon Counting
• Global calibration of large-scale photonic integrated circuits
• Synthetic photonic lattice for single-shot reconstruction of frequency combs
• Robust Classical and Quantum Polarimetry with a Single Nanostructured Metagrating
• In-line detection and reconstruction of multi-photon quantum states
• Implementing positive-operator-valued-measurement elements in photonic circuits for performing minimum quantum state tomography of path qudits
• Complex structure and characterization of multi-photon split states in integrated circuits
• 3D compact photonic circuits for realizing quantum state tomography of qudits in any finite dimension