Photonic hyperentanglement in polarisation and frequency via joint spectrum shaping
arXiv:2603.03428 · doi:10.1364/OPTICAQ.596943
Abstract
Hyperentanglement offers enhanced capacity for quantum information processing and communication protocols, especially in combination with robust high-dimensional degrees of freedom such as frequency-bin encoding. Here, we present a single-pass, unfiltered, down-conversion source of hyperentangled photon pairs in polarisation and frequency-bin degrees of freedom with dynamically tunable state dimension and composition at telecom wavelengths. We achieve this by optimal tailoring of the photons' joint spectral amplitude via pump and nonlinearity shaping. Using polarisation-resolved time-of-flight spectrometry and Hong-Ou-Mandel interference, we characterise the hyperentangled states and demonstrate for the polarisation component fidelities exceeding 99% averaged over frequency bins and concurrences above 98%. The degree of spectral entanglement, quantified by the Hong-Ou-Mandel visibility, is measured as 90%, well in line with numerical simulations. This approach provides a scalable route toward high-dimensional quantum states for quantum communication and computing applications.
References in corpus (38)
- The Quantum Internet
- Experimental quantum teleportation
- Entanglement of Orbital Angular Momentum States of Photons
- Photonic quantum technologies
- Beating the channel capacity limit for linear photonic superdense coding
- Generation of Hyperentangled Photons Pairs
- Pulsed energy-time entangled twin-photon source for quantum communication
- Twisted Photons: New Quantum Perspectives in High Dimensions
- Advances in High Dimensional Quantum Entanglement
- A wavelength-tunable fiber-coupled source of narrowband entangled photons
- Polarization Entanglement Purification using Spatial Entanglement
- A trusted-node-free eight-user metropolitan quantum communication network
- Frequency-encoded photonic qubits for scalable quantum information processing
- Hyperentanglement-assisted Bell-state analysis
- A Quantum Pulse Gate based on Spectrally Engineered Sum Frequency Generation
- Complete and Deterministic discrimination of polarization Bell state assisted by momentum entanglement
- High-dimensional frequency-bin entangled photons in an optical microresonator on a chip
- Fiber-assisted single-photon spectrograph
- Tailoring nonlinear processes for quantum optics with pulsed temporal-mode encodings
- Joint Spectral Characterization of Photon-Pair Sources
- A Reconfigurable Quantum Local Area Network Over Deployed Fiber
- Experimental Single-Copy Entanglement Distillation
- Anti-symmetrization reveals hidden entanglement
- Experimental one-step deterministic entanglement purification
- Realization of a multi-output quantum pulse gate for decoding high-dimensional temporal modes of single-photon states
- Hyperentangled Time-bin and Polarization Quantum Key Distribution
- Design Considerations for High-purity Heralded Single Photon Sources
- Frequency-bin entanglement from domain-engineered down-conversion
- Direct generation of tailored pulse-mode entanglement
- Generation of time-frequency grid state with integrated biphoton frequency combs
- Complete hyperentangled Bell state analysis for polarization and time-bin hyperentanglement
- Resource-efficient photonic quantum computation with high-dimensional cluster states
- Generation and characterization of ultrabroadband polarization-frequency hyperentangled photons
- Recent advances in high-dimensional mode-locked quantum frequency combs
- Remotely Establishing Polarization Entanglement over Noisy Polarization Channels
- Energy-time and time-bin entanglement: past, present and future
- Hyper-entanglement between pulse modes and frequency bins
- Optimised spectral purity of unfiltered photons via pump and nonlinearity shaping