"USC researchers developed an optical filter that preserves quantum entanglement using anti–parity-time symmetry. This breakthrough enables more reliable quantum technologies and was successfully tested with over 99% fidelity. Credit: SciTechDaily.com" (ScitechDaily, 99% Fidelity: USC Scientists Create First-Ever Quantum Filter To Preserve Entanglement)
Quantum filter is the thing. That decreases noise in a quantum system. Or it's mission is to separate noise from the quantum system. The noise is the energy that breaks information in the quantum entanglement. When we think about the rules of computers the number of qubit states determines how sensitive the system is to outside interference.
The increase in the qubit states means. The quantum computer becomes more powerful. The problem is that the quantum computer packs data into a photon and then sends it to another photon using superposition and entanglement. That thing requires a very high accuracy. If there is lots of wave movement or interference that thing is impossible.
One of the most critical things in quantum computing is to separate necessary information from the "white noise". Without that ability. The quantum computer is useless. The quantum filter removes garbage from the quantum information. That makes it more effective.
"The breakthrough at the heart of this work comes from a surprising idea in theoretical physics called anti–parity-time (APT) symmetry—a concept that has only recently begun to attract attention in the world of optics. Most traditional optical systems are designed to avoid loss and maintain symmetry, meaning that light flows in predictable, balanced ways. " (ScitechDaily, 99% Fidelity: USC Scientists Create First-Ever Quantum Filter To Preserve Entanglement)
"But APT-symmetric systems take a very different approach: they embrace loss—not randomly, but in a precise and carefully controlled manner. By combining this engineered dissipation with the power of interference, these systems offer a unique and counterintuitive way to steer how light behaves. This unconventional control opens up exciting possibilities for manipulating light in ways that were previously thought to be impossible." (ScitechDaily, 99% Fidelity: USC Scientists Create First-Ever Quantum Filter To Preserve Entanglement)
https://scitechdaily.com/99-fidelity-usc-scientists-create-first-ever-quantum-filter-to-preserve-entanglement/