Near-maximal two-photon entanglement for quantum communications at 2.1 $\mu$m

Abstract

Owing to a reduced solar background and low propagation losses in the atmosphere, the 2- to 2.5-$\mu$m waveband is a promising candidate for daylight quantum communication. This spectral region also offers low losses and low dispersion in hollow-core fibers and in silicon waveguides. We demonstrate for the first time near-maximally entangled photon pairs at 2.1 $\mu$m that could support device independent quantum key distribution (DIQKD) assuming sufficiently high channel efficiencies. The state corresponds to a positive secure-key rate (0.254 bits/pair, with a quantum bit error rate of 3.8%) based on measurements in a laboratory setting with minimal channel loss and transmission distance. This is promising for the future implementation of DIQKD at 2.1 $\mu$m.

References in corpus (24)

• Quantum Cryptography
• Quantum cryptography: Public key distribution and coin tossing
• Entanglement of a Pair of Quantum Bits
• On the Measurement of Qubits
• Satellite-to-ground quantum key distribution
• Device-independent security of quantum cryptography against collective attacks
• Free-Space distribution of entanglement and single photons over 144 km
• Quantum Cryptography with Entangled Photons
• Satellite-relayed intercontinental quantum network
• Device-independent quantum key distribution secure against collective attacks
• Self-testing of quantum systems: a review
• Quantum non-locality in two three-level systems
• Detecting Infrared Single Photons with Near-Unity System Detection Efficiency
• Entanglement versus Bell violations and their behaviour under local filtering operations
• All Pure Bipartite Entangled States can be Self-Tested
• Daylight quantum key distribution over 1.6 km
• Full daylight quantum-key-distribution at 1550 nm enabled by integrated silicon photonics
• Analytic and nearly optimal self-testing bounds for the Clauser-Horne-Shimony-Holt and Mermin inequalities
• Entangled Photon-Pair Sources based on three-wave mixing in bulk crystals
• Efficient quantum key distribution secure against no-signalling eavesdroppers
• Device-Independent Quantum Key Distribution with Random Key Basis
• Two-photon Quantum Interference and Entanglement at 2 μm
• Mid-infrared quantum optics in silicon
• A weak form of self-testing

Cited by in corpus (2)

• Quantum entanglement generation on magnons assisted with microwave cavities coupled to a superconducting qubit
• Polarization Purity and Dispersion Characteristics of Nested Antiresonant Nodeless Hollow-Core Optical Fiber at Near- and Short-wave-IR Wavelengths for Quantum Communications