Direct estimation of decoherence rates
| Authors | |
|---|---|
| Year of publication | 2012 |
| Type | Article in Periodical |
| Magazine / Source | Physical Review A (Atomic, Molecular, and Optical Physics) |
| MU Faculty or unit | |
| Citation | |
| Web | http://link.aps.org/doi/10.1103/PhysRevA.86.052109 |
| Doi | http://dx.doi.org/10.1103/PhysRevA.86.052109 |
| Field | Information theory |
| Keywords | estimation; decoherence; unitary k designs |
| Description | The decoherence rate is a nonlinear channel parameter that describes quantitatively the decay of the off-diagonal elements of a density operator in the decoherence basis. We address the question of how to experimentally access such a nonlinear parameter directly without the need for complete process tomography. In particular, we design a simple experiment working with two copies of the channel, in which the registered mean value of a two-valued measurement directly determines the value of the average decoherence rate. No prior knowledge of the decoherence basis is required. |
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