Quantum entanglement between an optical photon and a solid-state spin qubit

By E. Togan, Y. Chu, A. Trifonov, Liang Jiang, J. Maze, L. Childress, M. Dutt, Anders Søndberg Sørensen, P. Hemmer, A. Zibrov and 2 more. Nature, 2010

1,143 citations recorded by the source corpus.

Quantum entanglement is among the most fascinating aspects of quantum theory. Entangled optical photons are now widely used for fundamental tests of quantum mechanics and applications such as quantum cryptography. Several recent experiments demonstrated entanglement of optical photons with trapped ions, atoms and atomic ensembles, which are then used to connect remote long-term memory nodes in distributed quantum networks. Here we realize quantum entanglement between the polarization of a single optical photon and a solid-state qubit associated with the single electronic spin of a nitrogen vacancy centre in diamond. Our experimental entanglement verification uses the quantum eraser technique, and demonstrates that a high degree of control over interactions between a solid-state qubit and the quantum light field can be achieved. The reported entanglement source can be used in studies of fundamental quantum phenomena and provides a key building block for the solid-state realization of quantum optical networks.

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

View Paper: https://www.semanticscholar.org/paper/35e72f5eafce5d0a8853add98956d5ec2f58d9f4

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Citations in the corpus

Deterministic enhancement of coherent photon generation from a nitrogen-vacancy center in ultrapure diamond (2017, background): “Advances in spin-photon entanglement [5] and twophoton quantum interference protocols [6,7] pave the way for the implementation of quantum teleportation [8] and long-distance spin-spin entanglement [9].”
Hybrid quantum circuits: Superconducting circuits interacting with other quantum systems (2012, background): “…by NV centers in two separate diamond samples (Sipahigil et al., 2012) [or two separate NV centers in the same diamond sample (Bernien et al., 2012)] and quantum entanglement between a polarized optical photon and a NV center qubit (Togan et al., 2010) have recently been realized in experiment.”
Diamond-based single-photon emitters (2011, background): “spin qubit, associated with the single electronic spin of the NV center [160].”
Laser writing of coherent colour centres in diamond (2016, methodology): “been used to demonstrate spin-photon entanglement [15] and entanglement between distant spins [16].”
A quantum network of clocks (2013, methodology): “The remote entanglement can be implemented by using recently demonstrated techniques for individual atom-photon entanglement [25–29].”
High-fidelity projective read-out of a solid-state spin quantum register (2011, background): “Ultimately, integration of multi-spin registers with quantum optical channels via spin-photon entanglement [13] may enable their application as few-qubit nodes in long-distance quantum communication protocols or distributed quantum information processing networks.”