Asymptotically well-behaved input states do not violate additivity for conjugate pairs of random quantum channels

Abstract

It is now well-known that, with high probability, the additivity of minimum output entropy does not hold for a pair of a random quantum channel and its complex conjugate. We investigate asymptotic behavior of output states of $r$-tensor powers of such pairs, as the dimension of inputs grows. We compute the limit output states for any sequence of well-behaved inputs, which consist of a large class of input states having a nice set of parameters. Then, we show that among these input states tensor products of Bell states give asymptotically the least output entropy, giving positive mathematical evidence towards additivity of above pairs of channels.

References in corpus (3)

• Hastings' additivity counterexample via Dvoretzky's theorem
• Realigning random states
• Low entropy output states for products of random unitary channels

Cited by in corpus (8)

• Random matrix techniques in quantum information theory
• Optimization over trace polynomials
• Almost one bit violation for the additivity of the minimum output entropy
• Revisiting additivity violation of quantum channels
• Positive univariate trace polynomials
• Additivity rates and PPT property for random quantum channels
• Estimates for compression norms and additivity violation in quantum information
• On the minimum output entropy of random orthogonal quantum channels