Proposal for demonstration of long-range cluster state entanglement in the presence of photon loss

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Nutz, Thomas; Milne, Antony; Shadbolt, Pete and Rudolph, Terry. 2017. Proposal for demonstration of long-range cluster state entanglement in the presence of photon loss. APL Photonics, 2(6), 066103. ISSN 2378-0967 [Article]

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Official URL: https://aip.scitation.org/doi/10.1063/1.4983822

Abstract or Description

Photonic cluster states are a crucial resource for optical quantum computing. Recently a quantum dot single photon source has been demonstrated to produce strings of photons in a linear cluster state, but high photon loss rates make it impossible to characterize the entanglement generated by conventional methods. We present a benchmarking method for such sources that can be used to demonstrate useful long-range entanglement with currently available collection/detection efficiencies below 1%. Measurement of the polarization state of single photons in different bases can provide an estimate for the three-qubit correlation function hZXZi. This value constrains correlations spanning more than three qubits, which in turn provide a lower bound for the localizable entanglement between any two qubits in the large state produced by the source. Finite localizable entanglement can be established by demonstrating hZXZi > 2/3 . This result enables photonic experiments demonstrating computationally useful entanglement with currently available technology.

Item Type:

Article

Identification Number (DOI):

https://doi.org/10.1063/1.4983822

Keywords:

Optical devices; Quantum dots; Spin-spin interactions; Quantum mechanical systems and processes; Quantum state; Photonic entanglement; Photoelectric effect; Quantum computing; Quantum information; Quantum tomography.

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