Engineers at Boeing demonstrated a key quantum protocol during ground testing of the payload for the Q4S mission, ahead of its launch scheduled in 2027. Boeing’s self-funded Q4S missions are critical in realizing a space-based quantum network in the future. 

The recent growth in interest for quantum computing and sensors has also pushed demand for quantum networks, where information can be shared with high security and reliability. For any network to work, information needs to be routed efficiently. 

While this has been successfully done for quantum networks using fiber-optic cables, transmission losses become significantly higher as the networks scale from regional to national scales. For data transmission over hundreds of miles, free-space optical channels are much more efficient than fiber-optic cables, prompting the need for a space-based quantum network.

Scientists are therefore working to develop these networks, and Boeing’s Q4S mission is one such project. 

What is Q4S mission? 

Boeing is making a major move towards developing a quantum space network through its Q4S mission. 

“Quantum networking has the potential to transform how information is shared, timed and protected across global systems, but only if it can work outside the lab, under real mission constraints,” said Lane Ballard, Boeing chief technology officer, in a statement. “Q4S is about taking an important quantum capability and proving it on mission-ready hardware.”

As part of the project, the mission will spend a year in orbit to test quantum networking hardware in the harsh environment of space. During these tests, the mission will demonstrate entanglement swapping, the foundational mechanism that enables quantum links to extend beyond point-to-point connections. 

What is entanglement swapping? 

Quantum entanglement swapping relies on quantum teleportation, where a quantum state of a particle can be transferred to another without physically moving the particle. In entanglement swapping, teleportation occurs between entangled photon pairs, resulting in a shared state between the particles, even though they have never interacted. 

Quantum entanglement swapping is the basis for quantum repeaters, which are crucial for scaling quantum networks. For Boeing to build a scalable quantum network, it needs to first demonstrate entanglement swapping between photons, without loss or degradation of quantum data. 

Demonstrating this in space will be challenging, since quantum states are delicate and entanglement can be disrupted by factors such as environmental temperature and radiation. 

“One of the hardest parts of quantum networking is maintaining strong performance while working within the size, weight and power limits of a spacecraft,” added Lowell in the statement. 

In their recent tests, Boeing engineers demonstrated quantum entanglement swapping in a space-qualified Q4S payload ahead of its launch to orbit. The results are comparable to peer-reviewed experiements, operating within the strict Size, Weight, and Power (SWaP) constraints of a compact satellite. 

“These test results show that we can produce high-fidelity swaps on a payload engineered for space, not just for a controlled lab bench,” concluded Lowell. “That is a meaningful step toward practical quantum networks.”

The Q4S mission is scheduled for launch in 2027. Following the one year data gathering in orbit, Boeing plans to share its technical results for peer-review. 

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