dorsal/arxiv
View SchemaEfficient universal programmable quantum measurements
| Authors | Giacomo Mauro D'Ariano, Paolo Perinotti |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0410169 |
| URL | https://arxiv.org/abs/quant-ph/0410169 |
| DOI | 10.1103/PhysRevLett.94.090401 |
| Journal | Phys. Rev. Lett. 94, 090401 (2005) |
Abstract
A universal programmable detector is a device that can be tuned to perform any desired measurement on a given quantum system, by changing the state of an ancilla. With a finite dimension d for the ancilla only approximate universal programmability is possible, with "size" d=f(1/e) increasing function of the "accuracy" 1/e. In this letter we show that, much better than the exponential size known in the literature, one can achieve polynomial size. An explicit example with linear size is also presented. Finally, we show that for covariant measurements exact programmability is feasible.
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"abstract": "A universal programmable detector is a device that can be tuned to perform\nany desired measurement on a given quantum system, by changing the state of an\nancilla. With a finite dimension d for the ancilla only approximate universal\nprogrammability is possible, with \"size\" d=f(1/e) increasing function of the\n\"accuracy\" 1/e. In this letter we show that, much better than the exponential\nsize known in the literature, one can achieve polynomial size. An explicit\nexample with linear size is also presented. Finally, we show that for covariant\nmeasurements exact programmability is feasible.",
"arxiv_id": "quant-ph/0410169",
"authors": [
"Giacomo Mauro D\u0027Ariano",
"Paolo Perinotti"
],
"categories": [
"quant-ph"
],
"doi": "10.1103/PhysRevLett.94.090401",
"journal_ref": "Phys. Rev. Lett. 94, 090401 (2005)",
"title": "Efficient universal programmable quantum measurements",
"url": "https://arxiv.org/abs/quant-ph/0410169"
},
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