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Experimental optical phase measurement approaching the exact Heisenberg limit
Shakib Daryanoosh, Sergei Slussarenko, Dominic W. Berry +2
The use of quantum resources can provide measurement precision beyond the shot-noise limit (SNL). The task of ab initio optical phase measurement---the estimation of a completely u…
Strong unitary and overlap uncertainty relations: theory and experiment
Kok-Wei Bong, Nora Tischler, Raj B. Patel +3
We derive and experimentally investigate a strong uncertainty relation valid for any unitary operators, which implies the standard uncertainty relation as a special case, and w…
Error-tolerant witnessing of divergences in classical and quantum statistical complexity
Farzad Ghafari, Mile Gu, Joseph Ho +4
How much information do we need about a process' past to faithfully simulate its future? The statistical complexity is a prominent quantifier of structure for stochastic processes.…
Necessary Condition for Steerability of Arbitrary Two-Qubit States with Loss
Travis J. Baker, Sabine Wollmann, Geoff J. Pryde +1
Einstein-Podolsky-Rosen steering refers to the quantum phenomenon whereby the state of a system held by one party can be "steered" into different states at the will of another, dis…
Unconditional violation of the shot noise limit in photonic quantum metrology
Sergei Slussarenko, Morgan M. Weston, Helen M. Chrzanowski +4
Interferometric phase measurement is widely used to precisely determine quantities such as length, speed, and material properties. Without quantum correlations, the best phase sens…
Taking tomographic measurements for photonic qubits 88 ns before they are created
Zhibo Hou, Qi Yin, Chao Zhang +6
We experimentally demonstrate that tomographic measurements can be performed for states of qubits before they are prepared. A variant of the quantum teleportation protocol is used…