Procrustean entanglement concentration in quantum-classical networking
arXiv:2401.01311 · doi:10.1103/PhysRevApplied.21.044027
Abstract
The success of a future quantum internet will rest in part on the ability of quantum and classical signals to coexist in the same optical fiber infrastructure, a challenging endeavor given the orders of magnitude differences in flux of single-photon-level quantum fields and bright classical traffic. We theoretically describe and experimentally implement Procrustean entanglement concentration for polarization-entangled states contaminated with classical light, showing significant mitigation of crosstalk noise in dense wavelength-division multiplexing. Our approach leverages a pair of polarization-dependent loss emulators to attenuate highly polarized crosstalk that results from imperfect isolation of conventional signals copropagating on shared fiber links. We demonstrate our technique both on the tabletop and over a deployed quantum local area network, finding a substantial improvement of two-qubit entangled state fidelity from approximately 75\% to over 92\%. This local filtering technique could be used as a preliminary step to reduce asymmetric errors, potentially improving the overall efficiency when combined with more complex error mitigation techniques in future quantum repeater networks.
arXiv comment6 pages, 5 figures
References in corpus (33)
- A computable measure of entanglement
- Concentrating Partial Entanglement by Local Operations
- Simple Proof of Security of the BB84 Quantum Key Distribution Protocol
- The logarithmic negativity: A full entanglement monotone that is not convex
- Distillation of secret key and entanglement from quantum states
- From Classical to Quantum Shannon Theory
- Optimal, reliable estimation of quantum states
- Quantum key distribution and 1 Gbit/s data encryption over a single fibre
- Maximal entanglement versus entropy for mixed quantum states
- Maximizing the entanglement of two mixed qubits
- Quantum key distribution with entangled photon sources
- Coexistence of high-bit-rate quantum key distribution and data on optical fiber
- Integrating quantum key distribution with classical communications in backbone fiber network
- Quantum key distribution for 10 Gb/s dense wavelength division multiplexing networks
- Feasibility of quantum key distribution through dense wavelength division multiplexing network
- Secure quantum key distribution with an uncharacterized source
- Maximally entangled mixed states: Creation and concentration
- Mixed state sensitivity of several quantum information benchmarks
- A practical and efficient approach for Bayesian quantum state estimation
- Unscrambling Entanglement through a Complex Medium
- A Reconfigurable Quantum Local Area Network Over Deployed Fiber
- A controlled-NOT gate for frequency-bin qubits
- Bayesian tomography of high-dimensional on-chip biphoton frequency combs with randomized measurements
- Experimental Entanglement Distillation of Two-qubit Mixed States Under Local filtering Operations
- Demonstration of 17λ x 10 Gb/s C-Band Classical / DV-QKD Co-Existence Over Hollow-Core Fiber Link
- Tuning quantum channels to maximize polarization entanglement for telecom photon pairs
- Entanglement Manipulation and Concentration
- Designing Noise-Robust Quantum Networks Coexisting in the Classical Fiber Infrastructure
- Broadband polarization-entangled source for C+L-band flex-grid quantum networks
- Generation and characterization of ultrabroadband polarization-frequency hyperentangled photons
- Two-mode squeezing over deployed fiber coexisting with conventional communications
- Optimal resource allocation for flexible-grid entanglement distribution networks
- Characterization of Quantum Frequency Processors
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- Integrating Quantum Computing Resources into Scientific HPC Ecosystems
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- Scalable low-latency entanglement distribution for distributed quantum computing
- Hybrid classical-quantum communication networks
- In situ quantum verification of polarization-stabilized optical channels