When Lihong Wang's team at the California Institute of Technology first showed in 2023 that they could double a microscope's sharpness using a strange quantum trick, many scientists assumed that was the limit. Wang disagreed. Now his lab has built a microscope four times sharper than regular ones, and he's already talking about going even further. "We have entered a new physical regime," Wang says. "This points us in a direction where we can improve even further—10 times or maybe even 100 times—down the road." The secret behind this leap lies in a quantum phenomenon called entanglement, which links two particles so deeply that what happens to one instantly affects the other, no matter how far apart they are. Wang's team splits pairs of light particles called photons, sending one through the sample they want to examine while its partner takes a separate path. Because these linked photons behave in some ways like a single particle with twice the energy, the microscope can see details at half the wavelength of ordinary light—roughly twice as sharp as before. To push beyond that, the researchers found a clever workaround: instead of letting the partner photon travel just once through the microscope's lenses, they send it through three times by bouncing it back with a magnetic field and using special beam splitters that control a property called polarization. That triple pass boosts the sharpness fourfold. The team tested their system on a standard resolution target, measuring how sharply it could capture fine edges and tiny features. The old two-pass setup resolved details about 1.8 times better than a normal microscope. The new triple-pass version hit roughly four times better. Beyond the technical achievement, the implications for medicine are significant. Conventional high-resolution eye imaging sometimes uses light so intense it can briefly affect a patient's vision. Wang's quantum microscope produces much weaker signals while delivering sharper pictures, meaning doctors might someday see individual cell nuclei and mitochondria without risking damage to living tissue. The same advantage could help inspect delicate semiconductor chips, where existing methods often sacrifice clarity to avoid harming the components. The findings appeared in the journal Science Advances.