Sep 20 2017 07:38 UTC

Sep 11 2017 07:08 UTC

Jun 14 2017 11:54 UTC

Planat scited Preprint Déjà Vu: an FAQ

May 11 2017 08:56 UTC

Planat scited Notwithstanding Bohr, the Reasons for QBism

Apr 14 2017 08:11 UTC

Planat commented on Magic informationally complete POVMs with permutations

First of all, thanks to all for helping to clarify some hidden points of our paper.

As you can see, the field norm generalizes the standard Hilbert-Schmidt norm.

It works for SIC [e.g. d=2, d=3 (the Hesse) and d=8 (the Hoggar)].

The first non-trivial case is with d=4 when one needs to extend the rational field

by a 12th root of unity, i.e. n=GCD(d,r)=GCD(4,3)=12, that is r=3 for defining the appropriate

fiducial state and d=4 to allow the action of the two-qubit Pauli group on it.

Then one needs the field norm in the so defined cyclotomic extension to normalize the vectors of the

resulting IC-POVM. This IC is dichotomic in angles and traces of paiwise products.

Incidently, such a 4-dimensional IC is related to the Mermin square through the traces of triple products.

Apr 13 2017 16:49 UTC

Planat commented on Magic informationally complete POVMs with permutations

To define the complex angle, we used the (cyclotomic) field norm to the power one over the degree of the field, as stated in the introduction. It recovers the particular case of angles for SICs. In this sense "equiangular" means that all pairs of distinct lines make the same angle.

Apr 13 2017 07:14 UTC

Planat commented on Magic informationally complete POVMs with permutations

The trace of pairwise product of (distinct) projectors is not constant. For example, with the state $(0,1,-1,-1,1)$, one gets an equiangular IC-POVM in which the trace is trivalued: it is either $1/16$, or $(7 \pm 3\sqrt{5})/32$. For the state (0,1,i,-i,-1), there are five values of the trace.

We should explicit this observation in the next version of the paper.

Apr 12 2017 13:58 UTC

Planat commented on Magic informationally complete POVMs with permutations

Yes, the IC-POVMs under consideration are minimal. The IC-POVM in dimension 5 is equiangular but is also not a SIC. In particular the trace product relation of a SIC is not satisfied. For the equiangular IC-POVM in dimension 7, we have a similar result.

Apr 07 2017 06:45 UTC

Apr 06 2017 08:48 UTC

Mar 20 2017 08:17 UTC

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Jan 30 2017 08:14 UTC

Planat scited On discrete structures in finite Hilbert spaces

Jan 27 2017 07:45 UTC

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Jan 24 2017 13:21 UTC

Planat scited SICs and Algebraic Number Theory

Jan 24 2017 13:19 UTC

Jan 24 2017 13:09 UTC

Jan 24 2017 13:09 UTC

Planat commented on The magic of universal quantum computing with permutations

Are you sure? Since we do not propose a conjecture, there is nothing wrong. A class of strange states underlie the pentagons in question. The motivation is to put the magic of computation in the permutation frame, one needs more work to check its relevance.

Mar 02 2014 07:47 UTC

Planat subscribed to Quantum Physics

Dec 15 2012 08:45 UTC

Planat joined SciRate

Dear Christopher,

1. Could you comment on the connection to the fine structure constant in footnote 15 in which you write "Implicit in it is the number 137!"?

2. Would the Qbism philosophy be destroyed by restricting to IC's instead of SICs as in https://scirate.com/arxiv/1704.02749#807?

Thanks.