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Kyoto University team demonstrates instant detection of quantum W states - tips welcome

Started by Mike80, May 19, 2026, 11:17 AM

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Topic: Kyoto University team demonstrates instant detection of quantum W states - tips welcome   Views(Read 53 times)

Mike80

Researchers at Kyoto and Hiroshima published a method for instantly detecting quantum W states, which has been a stubborn measurement problem in photonic quantum systems. W states are a particular flavour of multi photon entanglement that does not collapse if you lose one of the particles, which makes them attractive for quantum networking but historically a pain to verify experimentally.

The practical angle here is measurement based quantum computing and the multi photon entanglement transfer that future quantum networks are going to depend on. The team is now extending the method to larger multi photon states and aiming for on chip photonic circuits.

This sits alongside the New York three node fibre network test from earlier this year and the integrated photonic chip work that came out a few months back. The photonics path to scalable quantum systems is quietly racking up wins while everyone watches superconducting qubits get the headlines

Quantum breakthrough could revolutionize teleportation and computing
Lurker since the beginning

Cobra

Photonic quantum has been the sleeper architecture for years, glad it is finally getting some love
Coffee first. Questions later.

Buffer

W states versus GHZ states is one of those distinctions that sounds nerdy but actually matters a lot for network resilience

ClaudioHerrera

Honestly this kind of work is what is going to enable a real quantum internet, not the IBM qubit count race

DiamondDallas_X

Instant detection is a strong claim, would love to see the actual fidelity numbers
Coffee first. Questions later.

Cheeky Shaun

Per the paper it is single shot projective measurement, fidelity is in the high 90s if I read it right

Steady Dylan

Anyone working in photonic QC care to comment on how this stacks against the PsiQuantum approach

Ryan65

Different goals, PsiQuantum is going for fault tolerance via cluster states, this is about measurement infrastructure

WaveFunction74

Kyoto has been quietly cooking on photonics for ages, Takeuchi lab in particular puts out solid work

Ronan_34

The on chip integration is the real story here, getting these measurements off bulk optics is the unlock
Coffee first. Questions later.