Entanglement-free certification of entangling gates
arXiv:1301.7110 · doi:10.1103/PhysRevA.89.042323
Abstract
Not all quantum protocols require entanglement to outperform their classical alternatives. The nonclassical correlations that lead to this quantum advantage are conjectured to be captured by quantum discord. Here we demonstrate that discord can be explicitly used as a resource: certifying untrusted entangling gates without generating entanglement at any stage. We implement our protocol in the single-photon regime, and show its success in the presence of high levels of noise and imperfect gate operations. Our technique offers a practical method for benchmarking entangling gates in physical architectures in which only highly-mixed states are available.
5 pages, 2 figures
References in corpus (14)
- Quantum discord and the power of one qubit
- Experimental quantum computing without entanglement
- Quantum discord as resource for remote state preparation
- No-local-broadcasting theorem for quantum correlations
- Interpreting quantum discord through quantum state merging
- Operational interpretations of quantum discord
- Classical simulation of commuting quantum computations implies collapse of the polynomial hierarchy
- Linking Quantum Discord to Entanglement in a Measurement
- All non-classical correlations can be activated into distillable entanglement
- Operational Significance of Discord Consumption: Theory and Experiment
- Quantum discord bounds the amount of distributed entanglement
- Quantum discord and local demons
- Experimental distribution of entanglement with separable carriers
- Quantum locking of classical correlations and quantum discord of classical-quantum states
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- Generation of a non-zero discord bipartite state with classical second-order interference
- Experimental characterization of a non-local convertor for quantum photonic networks
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- Discord, quantum knowledge and private communications
- Realizing quantum advantage without entanglement in single-photon states