Multi-core fiber integrated multi-port beamsplitters for quantum information processing

Abstract

Multi-port beamsplitters are cornerstone devices for high-dimensional quantum information tasks, which can outperform the two-dimensional ones. Nonetheless, the fabrication of such devices has been proven to be challenging with progress only recently achieved with the advent of integrated photonics. Here, we report on the production of high-quality $N\times N$ (with $N=4,7$) multi-port beamsplitters based on a new scheme for manipulating multi-core optical fibers. By exploring their compatibility with optical fiber components, we create 4-dimensional quantum systems and implement the measurement-device-independent random number generation task with a programmable 4-arm interferometer operating at a 2 MHz repetition rate. Thanks to the high visibilities observed, we surpass the 1-bit limit of binary protocols and attain 1.23 bits of certified private randomness per experimental round. Our result demonstrates that fast switching, low-loss and high optical quality for high-dimensional quantum information can be simultaneously achieved with multi-core fiber technology.

References in corpus (31)

• Quantum Cryptography
• Security of quantum key distribution using d-level systems
• Secure Quantum Key Distribution
• Universal Linear Optics
• Advances in Photonic Quantum Sensing
• Generation of Hyperentangled Photons Pairs
• Experimental high-dimensional two-photon entanglement and violations of generalised Bell inequalities
• Violations of local realism by two entangled quNits are stronger than for two qubits
• Experimental Quantum Cryptography with Qutrits
• Multi-photon entanglement in high dimensions
• Experimental demonstration of a hyper-entangled ten-qubit Schrödinger cat state
• Conservation of orbital angular momentum in air core optical fibers
• A double-slit quantum eraser
• Semi-device-independent security of one-way quantum key distribution
• Computational advantage from quantum-controlled ordering of gates
• Statistical distinguishability between unitary operations
• High-Dimensional Quantum Key Distribution based on Multicore Fiber using Silicon Photonic Integrated Circuits
• Quantum key distribution with higher-order alphabets using spatially-encoded qudits
• Generation of maximally entangled states of qudits using twin photons
• Quantum information processing with space-division multiplexing optical fibres
• High speed self-testing quantum random number generation without detection loophole
• Quantum key distribution over multicore fiber
• Quantum key distribution session with 16-dimensional photonic states
• MHz-rate semi-device-independent quantum random number generators based on unambiguous state discrimination
• Multi-path entanglement of two photons
• Quantum process tomography of unitary and near-unitary maps
• Stable transmission of high-dimensional quantum states over a 2 km multicore fiber
• Measurement-device-independent entanglement and randomness estimation in quantum networks
• High-dimensional quantum communication complexity beyond strategies based on Bell's theorem
• Certifying an irreducible 1024-dimensional photonic state using refined dimension witnesses
• Decoherence in a double-slit quantum eraser