Lower bounds on the size of general Schrödinger-cat states from experimental data. (English) Zbl 1362.81013
Summary: Experimental progress with meso- and macroscopic quantum states (i.e. general Schrödinger-cat states) was recently accompanied by theoretical proposals on how to measure the merit of these efforts. So far, experiment and theory have been disconnected as theoretical analysis of actual experimental data was missing. Here, we consider a proposal for macroscopic quantum states that measures the extent of quantum coherence present in the system. For this, the quantum Fisher information is used. We calculate lower bounds from real experimental data. The results are expressed as an ‘effective size’, that is, relative to ‘classical’ reference states. We find remarkable numbers of up to 70 in photonic and atomic systems.
MSC:
| 81P40 | Quantum coherence, entanglement, quantum correlations |
| 81P05 | General and philosophical questions in quantum theory |
| 94A17 | Measures of information, entropy |
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