Phys.org May 4, 2024 Researchers in the UK developed a high sensitivity quantum sensing scheme for transverse displacement between two photons interfering at a balanced beam splitter. It is based on transverse-momentum sampling measurements at the output. They showed that their interferometric technique achieved the ultimate spatial precision in nature irrespective of the overlap of the two displaced photonic wave packets. The precision of the technique was marginally reduced when dealing with photons differing in nonspatial degrees of freedom. Their work could lead to enhanced high-precision nanoscopic techniques, such as super-resolved single-molecule localization microscopy with quantum dots, by circumventing the […]
Tag Archives: Beam splitter
How splitting sound might lead to a new kind of quantum computer
Phys.org July 5, 2023 Linear optical quantum computing provides a desirable approach to quantum computing, with only a short list of required computational elements. The similarity between photons and phonons points to the interesting potential for linear mechanical quantum computing using phonons in place of photons. Although single-phonon sources and detectors have been demonstrated, a phononic beam splitter element remains an outstanding requirement. Researchers at the University of Chicago demonstrated such an element, using two superconducting qubits to fully characterize a beam splitter with single phonons. They used the beam splitter to demonstrate two-phonon interference, a requirement for two-qubit gates […]