From ScienceAlert · Ivan Farkas · · 1m
Quantum Entanglement Measurement Breakthrough
Physicists measure 'other' quantum entanglement after 25 years.
In brief
Physicists measure 'other' quantum entanglement after 25 years. Physicists from Kyoto and Hiroshima universities measured W-state quantum entanglement in three photons for the first time, achieving 87% accuracy. Originally reported by ScienceAlert.
Quantum Entanglement Basics
Quantum entanglement connects particles so they share a quantum identity and exist in superposition until measured.
Quantum Entanglement Limitations
Entangled particles transmit random results instantly across distances but cannot send information faster than light.
W-State Entanglement
W-state entanglement retains useful quantum states even if one particle is lost, unlike GHZ states.
Quantum Tomography Challenge
Traditional quantum tomography requires many identical systems and exponentially increases with particle count.
New Measurement Technique
Researchers used a discrete Fourier transform optical circuit to measure W-state entanglement in three photons with one shot.
Measurement Results
The technique achieved 87% accuracy in identifying W-state entanglement, exceeding the 66.7% threshold for proof.
Next Steps
Researchers plan to develop on-chip photonic quantum circuits for improved quantum computing and cryptography.
The headline
Physicists from Kyoto and Hiroshima universities measured W-state quantum entanglement in three photons for the first time, achieving 87% accuracy.
