Experimental one-way quantum computing

By Philip Walther, Kevin J. Resch, Terry Rudolph, E. Schenck, Harald Weinfurter, Vlatko Vedral, Markus Aspelmeyer, Anton Zeilinger. Nature, 2005

1,151 citations recorded by the source corpus.

Standard quantum computation is based on sequences of unitary quantum logic gates that 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 characterize the quantum state fully by implementing 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.

Subfields: Artificial Intelligence, Atomic and Molecular Physics, and Optics

View Paper: https://www.semanticscholar.org/paper/8a529c1fc484047dc282a7ab83577fbd5d243099

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Citations in the corpus

Preparation and storage of frequency-uncorrelated entangled photons from cavity-enhanced spontaneous parametric downconversion (2011, methodology): “As the most common photonic entanglement source, the spontaneous parametric downconversion (SPDC) source has been exploited to demonstrate the principles of LOQ”
Quantum computing with trapped ions (2008, methodology): “, 2001b) and actually were used for quantum information processing (Walther et al., 2005; Lanyon et al., 2008), however, here the emphasis is naturally more on the transmission of quantum information rather than processing it.”
Determinism in the one-way model (2005, background): “computing. 1 Introduction The recent one-way quantum computing model [1, 2, 3] has already drawn considerable attention, mainly because it suggests diﬀerent physical realisations of quantum computing [4, 5, 6, 7, 8, 9]. Computation consists of a ﬁrst phase of preparation and entanglement, followed b”
Nobel Lecture: Controlling photons in a box and exploring the quantum to classical boundary (2013, background): “They have since then demonstrated various properties of nonclassical light and explored their possible applications for quantum communication (Gisin et al., 2002), quantum teleportation (Bouwmeester et al., 1997), and quantum computing (Walther et al., 2005).”
Boson Sampling on a Photonic Chip (2012, background): “Although there has been substantial progress in proof-of-principle demonstrations of quantum computation [6– 10], simultaneously meeting these demands has proven diﬃcult.”