Carter 

The paper I am presenting focuses on the transportation of entangled qubits, in the form of photon pairs, travelling underground in NYC fiber optic cables. Most computations rely on bits that exist as 0 or 1, but qubits can exist as both 0 and 1 at the same time. This is called superposition, and two qubits can be entangled, meaning their superposition states are correlated. The photons' polarization, or the direction of their oscillation, can exist as a superposition to serve as qubits and be distributed through cables. The goal of this paper was to separate entangled photon pairs to allow the utilization of their entanglement. However, transmitting photons can introduce disturbances that alter their quantum state and reduce the effectiveness of entanglement. A usable distribution system must have a high transportation rate and high accuracy/fidelity. The paper accomplished this by transporting the entangled photon alongside regular photons, allowing them to measure how the fiber affected any photon, and then reversing the effects on the entangled photon. After testing the distribution rate and accuracy of the entangled photons, they found success in both criteria: high rates and high fidelity. When optimized for efficiency, the researchers found they could transport >500,000 photons per second at 84% fidelity/accuracy. When optimized for accuracy, they achieved ~99% fidelity, distributing >20,000 photons a second. This research opens many doors for quantum applications, as the distribution of these photons, and more specifically qubits, are requirements for quantum communication, quantum cryptography, and future quantum infrastructure.