A research team has discovered a Heisenberg-limited metrology via weak-value amplification without using entangled resources. Most quantum information technologies including quantum computers – considered a step above supercomputers – and quantum communication that cannot be hacked are based on the principle of quantum entanglement. However, entangled systems exist in a small microscopic world and are pretty fragile. Quantum metrology, which provides enhanced sensitivity over conventional measurements in precision metrology, has also mainly relied on quantum entanglement, so that it is hard to implement in real life applications. Recently, a Korean research team has proposed a method to achieve the quantum metrology precision without using entangled resources.
A POSTECH research te...
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