In the double-scaling limit, the singular-value moments of products of truncated Haar unitary matrices equal a closed expression involving the Erlang delay function, from which the entropy reduction is computed.
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Entropy and singular-value moments of products of truncated random unitary matrices
In the double-scaling limit, the singular-value moments of products of truncated Haar unitary matrices equal a closed expression involving the Erlang delay function, from which the entropy reduction is computed.