All-photonic quantum repeaters
Can photonic repeaters distribute useful entanglement over many links without long-lived matter memories?
Communication systems
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Mobile terahertz beam management
Can narrow high-frequency wireless beams stay connected through movement and blockage without excessive tracking cost?
Microwave–optical quantum transduction
Can a practical interface transfer quantum information between microwave circuits and optical links with little loss or added noise?
Binary deletion channel capacity
What is the exact reliable information rate when bits disappear independently and the receiver cannot see where they were removed?
Worst-case trace reconstruction
Do polynomially many independently damaged copies always suffice to recover every unknown binary string exactly?
Shannon capacity of the seven-cycle
Seven symbols sit around a circle, and neighboring symbols can be confused. How many messages can long strings of these symbols carry with absolutely no decoding mistakes?
Binary symmetric channel reliability function
If each transmitted bit flips independently with a fixed probability, adding redundancy reduces mistakes. How quickly can the best possible error probability fall as the message block gets longer?
Li–Li network coding conjecture
Several senders share a network of two-way links. Can mixing their messages inside the network ever carry more independent traffic than forwarding and splitting the messages along paths?