dorsal/arxiv
View SchemaHigh-speed linear optics quantum computing using active feed-forward
| Authors | Robert Prevedel, Philip Walther, Felix Tiefenbacher, Pascal Böhi, Rainer Kaltenbaek, Thomas Jennewein, Anton Zeilinger |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0701017 |
| URL | https://arxiv.org/abs/quant-ph/0701017 |
| DOI | 10.1038/nature05346 |
| Journal | Nature 445, 65-69 (2007) |
Abstract
As information carriers in quantum computing, photonic qubits have the advantage of undergoing negligible decoherence. However, the absence of any significant photon-photon interaction is problematic for the realization of non-trivial two-qubit gates. One solution is to introduce an effective nonlinearity by measurements resulting in probabilistic gate operations. In one-way quantum computation, the random quantum measurement error can be overcome by applying a feed-forward technique, such that the future measurement basis depends on earlier measurement results. This technique is crucial for achieving deterministic quantum computation once a cluster state (the highly entangled multiparticle state on which one-way quantum computation is based) is prepared. Here we realize a concatenated scheme of measurement and active feed-forward in a one-way quantum computing experiment. We demonstrate that, for a perfect cluster state and no photon loss, our quantum computation scheme would operate with good fidelity and that our feed-forward components function with very high speed and low error for detected photons. With present technology, the individual computational step (in our case the individual feed-forward cycle) can be operated in less than 150 ns using electro-optical modulators. This is an important result for the future development of one-way quantum computers, whose large-scale implementation will depend on advances in the production and detection of the required highly entangled cluster states.
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"abstract": "As information carriers in quantum computing, photonic qubits have the\nadvantage of undergoing negligible decoherence. However, the absence of any\nsignificant photon-photon interaction is problematic for the realization of\nnon-trivial two-qubit gates. One solution is to introduce an effective\nnonlinearity by measurements resulting in probabilistic gate operations. In\none-way quantum computation, the random quantum measurement error can be\novercome by applying a feed-forward technique, such that the future measurement\nbasis depends on earlier measurement results. This technique is crucial for\nachieving deterministic quantum computation once a cluster state (the highly\nentangled multiparticle state on which one-way quantum computation is based) is\nprepared. Here we realize a concatenated scheme of measurement and active\nfeed-forward in a one-way quantum computing experiment. We demonstrate that,\nfor a perfect cluster state and no photon loss, our quantum computation scheme\nwould operate with good fidelity and that our feed-forward components function\nwith very high speed and low error for detected photons. With present\ntechnology, the individual computational step (in our case the individual\nfeed-forward cycle) can be operated in less than 150 ns using electro-optical\nmodulators. This is an important result for the future development of one-way\nquantum computers, whose large-scale implementation will depend on advances in\nthe production and detection of the required highly entangled cluster states.",
"arxiv_id": "quant-ph/0701017",
"authors": [
"Robert Prevedel",
"Philip Walther",
"Felix Tiefenbacher",
"Pascal B\u00f6hi",
"Rainer Kaltenbaek",
"Thomas Jennewein",
"Anton Zeilinger"
],
"categories": [
"quant-ph"
],
"doi": "10.1038/nature05346",
"journal_ref": "Nature 445, 65-69 (2007)",
"title": "High-speed linear optics quantum computing using active feed-forward",
"url": "https://arxiv.org/abs/quant-ph/0701017"
},
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