dorsal/arxiv
View SchemaDemonstration of an all-optical quantum controlled-NOT gate
| Authors | J L O'Brien, G J Pryde, A G White, T C Ralph, D Branning |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0403062 |
| URL | https://arxiv.org/abs/quant-ph/0403062 |
| DOI | 10.1038/natur= |
| Journal | Nature.426:264,2003 |
Abstract
The promise of tremendous computational power, coupled with the development of robust error-correcting schemes, has fuelled extensive efforts to build a quantum computer. The requirements for realizing such a device are confounding: scalable quantum bits (two-level quantum systems, or qubits) that can be well isolated from the environment, but also initialized, measured and made to undergo controllable interactions to implement a universal set of quantum logic gates. The usual set consists of single qubit rotations and a controlled-NOT (CNOT) gate, which flips the state of a target qubit conditional on the control qubit being in the state 1. Here we report an unambiguous experimental demonstration and comprehensive characterization of quantum CNOT operation in an optical system. We produce all four entangled Bell states as a function of only the input qubits' logical values, for a single operating condition of the gate. The gate is probabilistic (the qubits are destroyed upon failure), but with the addition of linear optical quantum non-demolition measurements, it is equivalent to the CNOT gate required for scalable all-optical quantum computation.
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"abstract": "The promise of tremendous computational power, coupled with the development\nof robust error-correcting schemes, has fuelled extensive efforts to build a\nquantum computer. The requirements for realizing such a device are confounding:\nscalable quantum bits (two-level quantum systems, or qubits) that can be well\nisolated from the environment, but also initialized, measured and made to\nundergo controllable interactions to implement a universal set of quantum logic\ngates. The usual set consists of single qubit rotations and a controlled-NOT\n(CNOT) gate, which flips the state of a target qubit conditional on the control\nqubit being in the state 1. Here we report an unambiguous experimental\ndemonstration and comprehensive characterization of quantum CNOT operation in\nan optical system. We produce all four entangled Bell states as a function of\nonly the input qubits\u0027 logical values, for a single operating condition of the\ngate. The gate is probabilistic (the qubits are destroyed upon failure), but\nwith the addition of linear optical quantum non-demolition measurements, it is\nequivalent to the CNOT gate required for scalable all-optical quantum\ncomputation.",
"arxiv_id": "quant-ph/0403062",
"authors": [
"J L O\u0027Brien",
"G J Pryde",
"A G White",
"T C Ralph",
"D Branning"
],
"categories": [
"quant-ph"
],
"doi": "10.1038/natur=",
"journal_ref": "Nature.426:264,2003",
"title": "Demonstration of an all-optical quantum controlled-NOT gate",
"url": "https://arxiv.org/abs/quant-ph/0403062"
},
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