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Timeline for Kraus operator rank

Current License: CC BY-SA 3.0

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May 7, 2020 at 5:07 answer added user38762 timeline score: 4
Dec 13, 2014 at 6:43 history tweeted twitter.com/#!/StackPhysics/status/543657368266223618
Oct 14, 2014 at 18:13 answer added Martin timeline score: 5
Oct 8, 2014 at 17:04 comment added Martin yes, you are making a mistake: A matrix of rank k kann be expressed as a sum of k rank-1 matrices (that's via singular value decomposition, just as Nielsen&Chuang say), but that doesn't mean that ANY decomposition into rank-1 matrices has at most k matrices. Rather the opposite: it has at least k matrices. Thus proving (which is trivial) that the summands in your some are of rank-1 doesn't get you anywhere.
Oct 8, 2014 at 5:04 review First posts
Oct 8, 2014 at 5:06
Oct 8, 2014 at 5:00 history asked user55552 CC BY-SA 3.0