Fault-tolerant quantum repeaters with minimal physical resources, and implementations based on single photon emitters

By L. Childress, Jacob M. Taylor, A. S. Sørensen, M. D. Lukin. 2005

230 citations recorded by the source corpus.

We analyze a method that uses fixed, minimal physical resources to achieve generation and nested purification of quantum entanglement for quantum communication over arbitrarily long distances and discuss its implementation using realistic photon emitters and photonic channels. In this method, we use single-photon emitters with two internal degrees of freedom formed by an electron spin and a nuclear spin to build intermediate nodes in a quantum channel. State-selective fluorescence is used for probabilistic entanglement generation between electron spins in adjacent nodes. We analyze in detail several approaches which are applicable to realistic, homogeneously broadened single-photon emitters. Furthermore, the coupled electron and nuclear spins can be used to efficiently implement entanglement swapping and purification. We show that these techniques can be combined to generate high-fidelity entanglement over arbitrarily long distances. We present a specific protocol that functions in polynomial time and tolerates percent-level errors in entanglement fidelity and local operations. The scheme has the lowest requirements on physical resources of any current scheme for fully fault-tolerant quantum repeaters.

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

View Paper: https://www.semanticscholar.org/paper/8b6ca684fa490a1deb22fbe08f6a6a04921e91fa

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In Artificial Intelligence

In Atomic and Molecular Physics, and Optics

Citations in the corpus

Electron–phonon processes of the silicon-vacancy centre in diamond (2014, background): “ppresses eects of spectral diusion, recently enabled demonstration of two-photon interference from separated emitters [8] that is a key requirement for many quantum information processing protocols [9, 10, 11, 12]. Interfacing coherent optical transitions with long-lived spin qubits is a key challen”
Quantum repeaters based on atomic ensembles and linear optics (2009, background): “Another interesting possibility to achieve a phase stable operation is to excite the two remote memories in a Sagnac interferometer configuration (Childress et al., 2005; Minar et al., 2008).”
Inside Quantum Repeaters (2015, background): “1(c) is based on a single photon being transmitted between the nodes [34], [44], [50], [51], [53], [56], [57].”
Excited-state spectroscopy of single NV defects in diamond using optically detected magnetic resonance (2008, background): “This knowledge is, however, crucial for single-spin high-speed coherent optical manipulation through !-based transitions [15]–[17] as well as for future implementation of quantum information protocols like quantum repeaters [18, 19] that can be used as a building block for a quantum network [20].”
Scalable Integration of Long-Lived Quantum Memories into a Photonic Circuit (2014, background): “[13] L.”
Multiphoton entanglement and interferometry (2008, background): “For instance, to maintain path length phase stabilities at the level of λ/10 (λ: wavelength) for single photons, typically of 54 Another attractive protocol due to Childress et al. (2005, 2006) also uses single-photon interference at photodetectors and thus suffers from the phase-stability problem.”