Is it Possible to Transmit Classical Information with Quantum Network Flow?

Click For Summary

Discussion Overview

The discussion revolves around the feasibility of transmitting classical information through a quantum network flow, specifically focusing on the mechanics of quantum communication and the roles of quantum computers in this process. The context includes theoretical exploration related to quantum computation and the potential for classical information transfer using qubits and entangled states.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested

Main Points Raised

  • One participant presents a scenario involving a network of quantum computers tasked with transmitting 4 classical bits per tick, utilizing one-way quantum communication lines.
  • Another participant questions the role of the top-left helper in the network, noting its inability to receive information but acknowledging its capacity to create and share Bell pairs.
  • There is a suggestion that the top-left helper could send out as many Bell pairs as possible, although this is described as potentially uninteresting.
  • A later reply expresses doubt about the solvability of the puzzle, indicating a need for the top-left helper to send 2 qubits per tick to the sender for the solution to be feasible.

Areas of Agreement / Disagreement

Participants express uncertainty regarding the effectiveness of the proposed solution and the role of the top-left helper, indicating that multiple competing views remain on how classical information can be transmitted in this quantum network scenario.

Contextual Notes

The discussion highlights limitations in the proposed solution, particularly regarding the assumptions about qubit transmission capabilities and the necessity for specific communication pathways to achieve the intended information transfer.

Strilanc
Science Advisor
Messages
612
Reaction score
229
This is a puzzle I came up with. I'm trying to judge whether the solution is obvious or not. Technically it's more closely related to quantum computation than quantum physics, but... let's try it anyways.

We find ourselves with the following network:

sXZSBrf.png


The goal is to find a way for the sender to transmit 4 classical bits of information to the receiver, per tick.

The boxes are quantum computers, capable of processing and sending/receiving qubits.

The edges are one-way quantum communication lines. The number next to the edge indicates how many qubits can be moved over the line per tick, and the direction of the arrow determines which direction the qubit can be sent.

There are initially no entangled qubits shared between any of the boxes, but of course the computers are capable of creating bell pairs and sending them over the communication lines.

For example, each tick the top-left helper could create a bell pair and transmit one of the parts to the sender and the other to the bottom-left helper. Then the bottom-left helper could forward that part to the receiver in the next tick. By pipelining the process, the sender and the receiver will share a fresh bell pair each tick, which is useful...
 
Physics news on Phys.org
The top left helper is looking a bit out on a limb. How does he get any information?
 
Jilang said:
The top left helper is looking a bit out on a limb. How does he get any information?

It can't receive any information, but it can be used for creating and sharing bell/EPR pairs. Bell pairs are useful because they can fuel superdense coding and quantum teleportation.
 
So does he just send out as many as he can? Seems like a boring sort of job!
 
Urgh, I think I made a mistake in my intended solution. The puzzle might not be solvable, without a way for H to send 2 qubits per tick to S.
 

Similar threads

Graduate What are some potential applications of quantum teleportation?
  • · Replies 8 ·
Replies
8
Views
7K
Graduate Superdense coding for sending 2 qubits at a time?
  • · Replies 1 ·
Replies
1
Views
3K
Graduate Is delayed choice remote entanglement of photons derived from TDSE?
  • · Replies 58 ·
2
Replies
58
Views
5K
Graduate Quantum teleportation and the density matrix
  • · Replies 1 ·
Replies
1
Views
3K
Graduate 'Advantages' of Quantum Encryption
  • · Replies 8 ·
Replies
8
Views
4K
Graduate Is Quantum Teleportation possible without a classical channel?
  • · Replies 2 ·
Replies
2
Views
4K
Graduate Using quantum-secured communication for data transfering
  • · Replies 2 ·
Replies
2
Views
2K
Graduate Why can't quantum crypto be broken this way
  • · Replies 11 ·
Replies
11
Views
3K
Graduate Is Entanglement Swapping Driven by Post-Selection or Bell State Measurement?
  • · Replies 79 ·
3
Replies
79
Views
10K
Quantum Workforce Elements, Toolbox for QIS Programs at Universities
  • · Replies 1 ·
Replies
1
Views
3K