Quantum Repeaters: What an Architect Needs to Know Before the Sales Call
A quantum repeater is not an amplifier. It is a machine that manufactures entanglement in segments and stitches them together. Here is how it…
Entanglement-as-a-Service: What Is Actually Being Sold
Entanglement can be delivered on demand, but it cannot be copied, amplified, or stored for long. Here is what an EaaS offer contains and…
Quantum Memory and Why Networks Need It
Quantum networks fail past a few hundred kilometres without a component that has no classical equivalent: a device that holds a qubit without reading…
What a Quantum Network Is Actually For
A quantum network does not carry your traffic. It produces a narrow set of outputs, and knowing exactly what those are is the difference…
Distributing Entanglement Across a Network: A Design-Level Guide
Loss, fidelity, and memory coherence set the shape of every quantum network. A working guide to direct transmission, entanglement swapping, and purification, with the…
Quantum Teleportation, Precisely
Teleportation is a fully specified protocol with a fixed cost: one entangled pair, one joint measurement, two classical bits. Here is what it does…
Beyond BB84: A Field Guide to Newer QKD Protocols
MDI, twin-field, continuous-variable and device-independent QKD each remove a different assumption from BB84. A guide to telling them apart before you design around one.