dorsal/arxiv
View SchemaExperimental One-Way Quantum Computing
| Authors | P. Walther, K. J. Resch, T. Rudolph, E. Schenck, H. Weinfurter, V. Vedral, M. Aspelmeyer, A. Zeilinger |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0503126 |
| URL | https://arxiv.org/abs/quant-ph/0503126 |
| DOI | 10.1038/nature03347 |
| Journal | Nature 434, 169-176 (2005) |
Abstract
Standard quantum computation is based on sequences of unitary quantum logic gates which process qubits. The one-way quantum computer proposed by Raussendorf and Briegel is entirely different. It has changed our understanding of the requirements for quantum computation and more generally how we think about quantum physics. This new model requires qubits to be initialized in a highly-entangled cluster state. From this point, the quantum computation proceeds by a sequence of single-qubit measurements with classical feedforward of their outcomes. Because of the essential role of measurement a one-way quantum computer is irreversible. In the one-way quantum computer the order and choices of measurements determine the algorithm computed. We have experimentally realized four-qubit cluster states encoded into the polarization state of four photons. We fully characterize the quantum state by implementing the first experimental four-qubit quantum state tomography. Using this cluster state we demonstrate the feasibility of one-way quantum computing through a universal set of one- and two-qubit operations. Finally, our implementation of Grover's search algorithm demonstrates that one-way quantum computation is ideally suited for such tasks.
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"abstract": "Standard quantum computation is based on sequences of unitary quantum logic\ngates which process qubits. The one-way quantum computer proposed by\nRaussendorf and Briegel is entirely different. It has changed our understanding\nof the requirements for quantum computation and more generally how we think\nabout quantum physics. This new model requires qubits to be initialized in a\nhighly-entangled cluster state. From this point, the quantum computation\nproceeds by a sequence of single-qubit measurements with classical feedforward\nof their outcomes. Because of the essential role of measurement a one-way\nquantum computer is irreversible. In the one-way quantum computer the order and\nchoices of measurements determine the algorithm computed. We have\nexperimentally realized four-qubit cluster states encoded into the polarization\nstate of four photons. We fully characterize the quantum state by implementing\nthe first experimental four-qubit quantum state tomography. Using this cluster\nstate we demonstrate the feasibility of one-way quantum computing through a\nuniversal set of one- and two-qubit operations. Finally, our implementation of\nGrover\u0027s search algorithm demonstrates that one-way quantum computation is\nideally suited for such tasks.",
"arxiv_id": "quant-ph/0503126",
"authors": [
"P. Walther",
"K. J. Resch",
"T. Rudolph",
"E. Schenck",
"H. Weinfurter",
"V. Vedral",
"M. Aspelmeyer",
"A. Zeilinger"
],
"categories": [
"quant-ph"
],
"doi": "10.1038/nature03347",
"journal_ref": "Nature 434, 169-176 (2005)",
"title": "Experimental One-Way Quantum Computing",
"url": "https://arxiv.org/abs/quant-ph/0503126"
},
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