Experimental quantum computing without entanglement.
By B. Lanyon, M. Barbieri, M. Almeida, A.G. White. Physical Review Letters, 2008
775 citations recorded by the source corpus.
Deterministic quantum computation with one pure qubit (DQC1) is an efficient model of computation that uses highly mixed states. Unlike pure-state models, its power is not derived from the generation of a large amount of entanglement. Instead it has been proposed that other nonclassical correlations are responsible for the computational speedup, and that these can be captured by the quantum discord. In this Letter we implement DQC1 in an all-optical architecture, and experimentally observe the generated correlations. We find no entanglement, but large amounts of quantum discord-except in three cases where an efficient classical simulation is always possible. Our results show that even fully separable, highly mixed, states can contain intrinsically quantum mechanical correlations and that these could offer a valuable resource for quantum information technologies.
Subfields: Artificial Intelligence
View Paper: https://www.semanticscholar.org/paper/b42572ca8541dc3140792a361ca39ff2a1fc9634
How researchers see this paper
The researchers whose trusted networks rank it highest, strongest advocate first. Every researcher gets a different order.
In Artificial Intelligence
- Stefano Pirandola
- Gerardo Adesso
- Vlatko Vedral
- Kavan Modi
- Tomasz Paterek
- H. Cable
- Aharon Brodutch
- Timothy C. Ralph
Citations in the corpus
- The classical-quantum boundary for correlations: Discord and related measures (2011, methodology): “In an NMR implementation of DQC1, (Passante et al., 2011) detect discord using the witness given in (Dakić et al., 2010), see Sec.”
- Quantum-enhanced measurements without entanglement (2017, background): “…of onequbit” (Knill and Laflamme, 1998): With a set of qubits 32 of which only a single one is initially in a pure state, a quantum enhancement is already possible in quantum computation, providing evidence for an important role of quantum discord (Datta et al., 2005; Lanyon et al., 2008) (see Sec.”
- Observing the operational significance of discord consumption (2012, background): “[4] Lanyon, B.”