Quantum reverse engineering and reference-frame alignment without nonlocal correlations
Journal Article
·
· Physical Review. A
- Grup de Fisica Teorica and IFAE, Facultat de Ciencies, Edifici Cn, Universitat Autonoma de Barcelona, 08193 Bellaterra, Barcelona (Spain)
The estimation of unknown qubit elementary gates and the alignment of reference frames are formally the same problem. Using quantum states made out of N qubits, we show that the theoretical precision limit for both problems, which behaves as 1/N{sup 2}, can be asymptotically attained with a covariant protocol that exploits the quantum correlation of internal degrees of freedom instead of the more fragile entanglement between distant parties. This cuts by half the number of qubits needed to achieve the precision of the dense covariant coding protocol.
- OSTI ID:
- 20645982
- Journal Information:
- Physical Review. A, Journal Name: Physical Review. A Journal Issue: 3 Vol. 70; ISSN 1050-2947; ISSN PLRAAN
- Country of Publication:
- United States
- Language:
- English
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