Volume of the quantum mechanical state space

Details Volume of the quantum mechanical state space Volume of the quantum mechanical state space

2006-04-14

arxiv.org/abs/math-ph/0604032v2

J. Phys. A: Math. Gen. 39 (2006) 13641-13657

Physics

Mathematical Physics

17 pages

Scientific paper

10.1088/0305-4470/39/44/003

The volume of the quantum mechanical state space over $n$-dimensional real, complex and quaternionic Hilbert-spaces with respect to the canonical Euclidean measure is computed, and explicit formulas are presented for the expected value of the determinant in the general setting too. The case when the state space is endowed with a monotone metric or a pull-back metric is considered too, we give formulas to compute the volume of the state space with respect to the given Riemannian metric. We present the volume of the space of qubits with respect to various monotone metrics. It turns out that the volume of the space of qubits can be infinite too. We characterize those monotone metrics which generates infinite volume.

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