Impossibility of Distinguishing Two Preparations for a Pure State from No-signaling
A pure state of a physical system can be prepared in an infinite number of ways. Quantum theory dictates that given a pure state of a physical system it is impossible to distinguish two preparation procedures. Here, we show that the impossibility of distinguishing two preparation procedures for the...
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| Format: | Article |
| Language: | English |
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Quanta
2020-10-01
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| Series: | Quanta |
| Online Access: | https://dankogeorgiev.com/ojs/index.php/quanta/article/view/54 |
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| Summary: | A pure state of a physical system can be prepared in an infinite number of ways. Quantum theory dictates that given a pure state of a physical system it is impossible to distinguish two preparation procedures. Here, we show that the impossibility of distinguishing two preparation procedures for the same pure state follows from the no-signaling principle. Extending this result for a pure bipartite entangled state entails that the impossibility of distinguishing two preparation procedures for a mixed state follows from the impossibility of distinguishing two preparations for a pure bipartite state.
Quanta 2020; 9: 16–21.
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| ISSN: | 1314-7374 |