dorsal/arxiv
View SchemaDirect measurement of non-linear properties of bipartite quantum states
| Authors | Fabio Antonio Bovino, Giuseppe Castagnoli, Artur Ekert, Pawel Horodecki, Carolina Moura Alves, Alexander Vladimir Sergienko |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0511187 |
| URL | https://arxiv.org/abs/quant-ph/0511187 |
| DOI | 10.1103/PhysRevLett.95.240407 |
Abstract
Non-linear properties of quantum states, such as entropy or entanglement, quantify important physical resources and are frequently used in quantum information science. They are usually calculated from a full description of a quantum state, even though they depend only on a small number parameters that specify the state. Here we extract a non-local and a non-linear quantity, namely the Renyi entropy, from local measurements on two pairs of polarization entangled photons. We also introduce a "phase marking" technique which allows to select uncorrupted outcomes even with non-deterministic sources of entangled photons. We use our experimental data to demonstrate the violation of entropic inequalities. They are examples of a non-linear entanglement witnesses and their power exceeds all linear tests for quantum entanglement based on all possible Bell-CHSH inequalities.
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"abstract": "Non-linear properties of quantum states, such as entropy or entanglement,\nquantify important physical resources and are frequently used in quantum\ninformation science. They are usually calculated from a full description of a\nquantum state, even though they depend only on a small number parameters that\nspecify the state. Here we extract a non-local and a non-linear quantity,\nnamely the Renyi entropy, from local measurements on two pairs of polarization\nentangled photons. We also introduce a \"phase marking\" technique which allows\nto select uncorrupted outcomes even with non-deterministic sources of entangled\nphotons. We use our experimental data to demonstrate the violation of entropic\ninequalities. They are examples of a non-linear entanglement witnesses and\ntheir power exceeds all linear tests for quantum entanglement based on all\npossible Bell-CHSH inequalities.",
"arxiv_id": "quant-ph/0511187",
"authors": [
"Fabio Antonio Bovino",
"Giuseppe Castagnoli",
"Artur Ekert",
"Pawel Horodecki",
"Carolina Moura Alves",
"Alexander Vladimir Sergienko"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.95.240407",
"title": "Direct measurement of non-linear properties of bipartite quantum states",
"url": "https://arxiv.org/abs/quant-ph/0511187"
},
"schema_id": "dorsal/arxiv",
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