Title | Entanglement-assisted alignment of reference frames using a dense covariant coding |
Publication Type | Journal Article |
Year of Publication | 2004 |
Authors | Bagan, E, Baig, M, Muñoz-Tapia, R |
Journal | Physical Review A (Atomic, Molecular, and Optical Physics) |
Volume | 69 |
Issue | 5 |
Pagination | 050303 |
Date Published | 05/2004 |
ISSN | 1050-2947 |
Abstract | We present a procedure inspired by dense coding, which enables a highly efficient transmission of information of a continuous nature. The procedure requires the sender and the recipient to share a maximally entangled state. We deal with the concrete problem of aligning reference frames or trihedra by means of a quantum system. We find the optimal covariant measurement and compute the corresponding average error, which has a remarkably simple close form. The connection of this procedure with that of estimating unitary transformations on qubits is briefly discussed. |
URL | https://link.aps.org/doi/10.1103/PhysRevA.69.050303 |
DOI | 10.1103/PhysRevA.69.050303 |
