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All path-symmetric pure states achieve their maximal phase sensitivity in conventional two-path interferometry
Holger F. Hofmann
It is shown that the condition for achieving the quantum Cramer-Rao bound of phase estimation in conventional two-path interferometers is that the state is symmetric with regard to…
Measurement and control of spatial qubits generated by passing photons through double-slits
Gen Taguchi, Tatsuo Dougakiuchi, Nobuaki Yoshimoto +4
We present an experimental study of the non-classical correlations of a pair of spatial qubits formed by passing two down-converted photons through a pair of double slits. After co…
How to simulate a quantum computer using negative probabilities
Holger F. Hofmann
The concept of negative probabilities can be used to decompose the interaction of two qubits mediated by a quantum controlled-NOT into three operations that require only classical…
Beating the standard quantum limit: Phase super-sensitivity of N-photon interferometers
Ryo Okamoto, Holger F. Hofmann, Tomohisa Nagata +3
Quantum metrology promises greater sensitivity for optical phase measurements than could ever be achieved classically. Here we present a theory of the phase sensitivity for the gen…