Reasonable conditions for joint probabilities of non-commuting observables

Abstract

In the operator formalism of quantum mechanics, the density operator describes the complete statistics of a quantum state in terms of d^2 independent elements, where d is the number of possible outcomes for a precise measurement of an observable. In principle, it is therefore possible to express the density operator by a joint probability of two observables that cannot actually be measured jointly because they do not have any common eigenstates. However, such joint probabilities do not refer to an actual measurement outcome, so their definition cannot be based on a set of possible events. Here, I consider the criteria that could specify a unique mathematical form of joint probabilities in the quantum formalism. It is shown that a reasonable set of conditions results in the definition of joint probabilities by ordered products of the corresponding projection operators. It is pointed out that this joint probability corresponds to the quasi probabilities that have recently been observed experimentally in weak measurements.

5 pages, no figures

References in corpus (2)

• Quantum theory of successive projective measurements
• State tomography via weak measurements

Cited by in corpus (5)

• How quantum paradoxes originate from the non-classical statistics of physical properties related to each other by half-periodic transformations
• Advantages of the Kirkwood-Dirac distribution among general quasi-probabilities for finite-state quantum systems
• What does the operator algebra of quantum statistics tell us about the objective causes of observable effects?
• Statistical signatures of quantum contextuality
• Quasi-probabilities in Conditioned Quantum Measurement and a Geometric/Statistical Interpretation of Aharonov's Weak Value