scholarly journals Magic informationally complete POVMs with permutations

2017 ◽  
Vol 4 (9) ◽  
pp. 170387 ◽  
Author(s):  
Michel Planat ◽  
Zafer Gedik

Eigenstates of permutation gates are either stabilizer states (for gates in the Pauli group) or magic states, thus allowing universal quantum computation (Planat, Rukhsan-Ul-Haq 2017 Adv. Math. Phys. 2017, 5287862 ( doi:10.1155/2017/5287862 )). We show in this paper that a subset of such magic states, when acting on the generalized Pauli group, define (asymmetric) informationally complete POVMs. Such informationally complete POVMs, investigated in dimensions 2–12, exhibit simple finite geometries in their projector products and, for dimensions 4 and 8 and 9, relate to two-qubit, three-qubit and two-qutrit contextuality.

2011 ◽  
Vol 84 (2) ◽  
Author(s):  
Daniel J. Brod ◽  
Ernesto F. Galvão

2008 ◽  
Vol 8 (10) ◽  
pp. 977-985
Author(s):  
Z.-Y. Xu ◽  
M. Feng ◽  
W.-M. Zhang

We investigate the possibility to have electron-pairs in decoherence-free subspace (DFS), by means of the quantum-dot cellular automata (QCA) and single-spin rotations, to deterministically carry out a universal quantum computation with high-fidelity. We show that our QCA device with electrons tunneling in two dimensions is very suitable for DFS encoding, and argue that our design favors a scalable quantum computation robust to collective dephasing errors.


Nature ◽  
2017 ◽  
Vol 549 (7671) ◽  
pp. 172-179 ◽  
Author(s):  
Earl T. Campbell ◽  
Barbara M. Terhal ◽  
Christophe Vuillot

Author(s):  
Valentin Kasper ◽  
Daniel González-Cuadra ◽  
Apoorva Hegde ◽  
Andy Xia ◽  
Alexandre Dauphin ◽  
...  

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