1204.2473 (Gaetana Spedalieri et al.)

A limit formula for the quantum fidelity    [PDF]

Gaetana Spedalieri, Christian Weedbrook, Stefano Pirandola

Quantum fidelity is a central tool in quantum information, quantifying how much two quantum states are similar. Here we propose a limit formula for the quantum fidelity between a mixed state and a pure state. As an example of an application, we apply this formula to the case of multimode Gaussian states, achieving a simple expression in terms of their first and second-order statistical moments.

View original: http://arxiv.org/abs/1204.2473