The Illinois Express Quantum Network (IEQNET) is a program to realize metro-scale quantum networking over deployed optical fiber using currently available technology. IEQNET consists of multiple sites that are geographically dispersed in the Chicago metropolitan area. Each site has one or more quantum nodes (Qnodes) representing the communication parties in a quantum network. Q-nodes generate or measure quantum signals such as entangled photons and communicate the results via standard, classical, means. The entangled photons in IEQNET nodes are generated at multiple wavelengths, and are selectively distributed to the desired users via optical switches. Here we describe the network architecture of IEQNET, including the Internet-inspired layered hierarchy that leverages software-defined-networking (SDN) technology to perform traditional wavelength routing and assignment between the Q-nodes. Specifically, SDN decouples the control and data planes, with the control plane being entirely classical. Issues associated with synchronization, calibration, network monitoring, and scheduling will be discussed. An important goal of IEQNET is demonstrating the extent to which the control plane can coexist with the data plane using the same fiber lines. This goal is furthered by the use of tunable narrow-band optical filtering at the receivers and, at least in some cases, a wide wavelength separation between the quantum and classical channels. We envision IEQNET to aid in developing robust and practical quantum networks by demonstrating metro-scale quantum communication tasks such as entanglement distribution and quantum-state teleportation.The Illinois Express Quantum Network (IEQNET) is a program to realize metro-scale quantum networking over deployed optical fiber using currently available technology. IEQNET consists of multiple sites that are geographically dispersed in the Chicago metropolitan area. Each site has one or more quantum nodes (Qnodes) representing the communication parties in a quantum network. Q-nodes generate or measure quantum signals such as entangled photons and communicate the results via standard, classical, means. The entangled photons in IEQNET nodes are generated at multiple wavelengths, and are selectively distributed to the desired users via optical switches. Here we describe the network architecture of IEQNET, including the Internet-inspired layered hierarchy that leverages software-defined-networking (SDN) technology to perform traditional wavelength routing and assignment between the Q-nodes. Specifically, SDN decouples the control and data planes, with the control plane being entirely classical. Issues associated with synchronization, calibration, network monitoring, and scheduling will be discussed. An important goal of IEQNET is demonstrating the extent to which the control plane can coexist with the data plane using the same fiber lines. This goal is furthered by the use of tunable narrow-band optical filtering at the receivers and, at least in some cases, a wide wavelength separation between the quantum and classical channels. We envision IEQNET to aid in developing robust and practical quantum networks by demonstrating metro-scale quantum communication tasks such as entanglement distribution and quantum-state teleportation.

arXiv:2104.04629Apr 9, 202124 citations

Design and Implementation of the Illinois Express Quantum Metropolitan Area Network

Joaquín Chung, Ely M. Eastman, Gregory S. Kanter +12 more

The Illinois Express Quantum Network (IEQNET) is a program to realize metropolitan scale quantum networking over deployed optical fiber using currently available technology. IEQNET consists of multiple sites that are geographically dispersed in the Chicago metropolitan area. Each site has one or more quantum nodes (Q-Nodes) representing the communication parties in a quantum network. Q-Nodes generate or measure quantum signals such as entangled photons and communicate the measurement results via standard, classical signals and conventional networking processes. The entangled photons in IEQNET nodes are generated at multiple wavelengths, and are selectively distributed to the desired users via transparent optical switches. Here we describe the network architecture of IEQNET, including the Internet-inspired layered hierarchy that leverages software-defined networking (SDN) technology to perform traditional wavelength routing and assignment between the Q-Nodes. Specifically, SDN decouples the control and data planes, with the control plane being entirely implemented in the classical domain. We also discuss the IEQNET processes that address issues associated with synchronization, calibration, network monitoring, and scheduling. An important goal of IEQNET is to demonstrate the extent to which the control plane classical signals can co-propagate with the data plane quantum signals in the same fiber lines (quantum-classical signal “coexistence”). This goal is furthered by the use of tunable narrow-band optical filtering at the receivers and, at least in some cases, a wide wavelength separation between the quantum and classical channels. We envision IEQNET to aid in developing robust and practical quantum networks by demonstrating metro-scale quantum communication tasks such as entanglement distribution and quantum-state teleportation.The Illinois Express Quantum Network (IEQNET) is a program to realize metropolitan scale quantum networking over deployed optical fiber using currently available technology. IEQNET consists of multiple sites that are geographically dispersed in the Chicago metropolitan area. Each site has one or more quantum nodes (Q-Nodes) representing the communication parties in a quantum network. Q-Nodes generate or measure quantum signals such as entangled photons and communicate the measurement results via standard, classical signals and conventional networking processes. The entangled photons in IEQNET nodes are generated at multiple wavelengths, and are selectively distributed to the desired users via transparent optical switches. Here we describe the network architecture of IEQNET, including the Internet-inspired layered hierarchy that leverages software-defined networking (SDN) technology to perform traditional wavelength routing and assignment between the Q-Nodes. Specifically, SDN decouples the control and data planes, with the control plane being entirely implemented in the classical domain. We also discuss the IEQNET processes that address issues associated with synchronization, calibration, network monitoring, and scheduling. An important goal of IEQNET is to demonstrate the extent to which the control plane classical signals can co-propagate with the data plane quantum signals in the same fiber lines (quantum-classical signal “coexistence”). This goal is furthered by the use of tunable narrow-band optical filtering at the receivers and, at least in some cases, a wide wavelength separation between the quantum and classical channels. We envision IEQNET to aid in developing robust and practical quantum networks by demonstrating metro-scale quantum communication tasks such as entanglement distribution and quantum-state teleportation.

arXiv:2207.09589IEEE Transactions on Quantum EngineeringJan 1, 202256 citations

Advances in quantum teleportation

Stefano Pirandola, Jens Eisert, Christian Weedbrook +2 more

arXiv:1505.07831Nature PhotonicsSep 29, 2015898 citations

New research to aid quantum computing, teleportation

Nature IndiaOct 17, 20150 citations

Quantum Teleportation Clarified: Network Milestone, Not Physics Breakthrough — E8 Intelligence Research

Andrew Stewart Caldin

FINDING: Quantum teleportation is a protocol for transferring an unknown qubit state via shared entanglement and classical communication — not physical matter transport; the Oxford "breakthrough" refers to network-level teleportation, not new physics. | MATH: Core protocol uses Bell basis: $|\Phi^\pm\rangle = \frac{1}{\sqrt{2}}(|00\rangle \pm |11\rangle)$ , $|\Psi^\pm\rangle = \frac{1}{\sqrt{2}}(|01\rangle \pm |10\rangle)$ . Teleportation of state $|\psi\rangle = \alpha|0\rangle + \beta|1\rangle$ yields 2 classical bits + 1 ebit (Bell pair) → fidelity 1 (ideal). Measurement outcomes: 4 Bell states → 4 unitary corrections $\{I, X, Z, XZ\}$ . No equation for "speed" — information transfer is classical-limited (≤ c). | CONNECTION: Bell states form a 4-element orthonormal basis — isomorphic to the Klein four-group $V_4$ (symmetry group of a rectangle, order 4). The 4 Bell states correspond to the 4 vertices of a square in $\mathbb{C}^2 \otimes \mathbb{C}^2$ — a $D_4$ (dihedral) Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.comFINDING: Quantum teleportation is a protocol for transferring an unknown qubit state via shared entanglement and classical communication — not physical matter transport; the Oxford "breakthrough" refers to network-level teleportation, not new physics. | MATH: Core protocol uses Bell basis: $|\Phi^\pm\rangle = \frac{1}{\sqrt{2}}(|00\rangle \pm |11\rangle)$, $|\Psi^\pm\rangle = \frac{1}{\sqrt{2}}(|01\rangle \pm |10\rangle)$. Teleportation of state $|\psi\rangle = \alpha|0\rangle + \beta|1\rangle$ yields 2 classical bits + 1 ebit (Bell pair) → fidelity 1 (ideal). Measurement outcomes: 4 Bell states → 4 unitary corrections $\{I, X, Z, XZ\}$. No equation for "speed" — information transfer is classical-limited (≤ c). | CONNECTION: Bell states form a 4-element orthonormal basis — isomorphic to the Klein four-group $V_4$ (symmetry group of a rectangle, order 4). The 4 Bell states correspond to the 4 vertices of a square in $\mathbb{C}^2 \otimes \mathbb{C}^2$ — a $D_4$ (dihedral) Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com

Sep 23, 20260 citations

|\Phi^\pm\rangle = \frac{1}{\sqrt{2}}(|00\rangle \pm |11\rangle)

|\Psi^\pm\rangle = \frac{1}{\sqrt{2}}(|01\rangle \pm |10\rangle)

. Teleportation of state

|\psi\rangle = \alpha|0\rangle + \beta|1\rangle

yields 2 classical bits + 1 ebit (Bell pair) → fidelity 1 (ideal). Measurement outcomes: 4 Bell states → 4 unitary corrections

\{I, X, Z, XZ\}

. No equation for "speed" — information transfer is classical-limited (≤ c). | CONNECTION: Bell states form a 4-element orthonormal basis — isomorphic to the Klein four-group

V_4

(symmetry group of a rectangle, order 4). The 4 Bell states correspond to the 4 vertices of a square in

\mathbb{C}^2 \otimes \mathbb{C}^2

— a

D_4

(dihedral) Author: Andrew Stewart Caldin, Independent Researcher, UK. Part of the E8 Intelligence Research series. Platform: e8intelligence.com