Demonstration of entanglement-by-measurement of solid-state qubits
By W. Pfaff, Tim Taminiau, L. Robledo, Hannes Bernien, M. Markham, Daniel J. Twitchen, Ronald Hanson. Nature Physics, 2012
190 citations recorded by the source corpus.
Entanglement is an important resource in quantum-enhanced technologies, but it is difficult to generate, especially in solid-state systems. An experiment now demonstrates the entanglement of two nuclear spins via a parity measurement of the electron spin in a nitrogen-vacancy centre in diamond. Projective measurements are a powerful tool for manipulating quantum states1,2,3,4,5,6,7,8,9,10,11,12,13. In particular, a set of qubits can be entangled by measuring a joint property3,4,5,6,7,8,9,10,11,12,13 such as qubit parity. These joint measurements do not require a direct interaction between qubits and therefore provide a unique resource for quantum information processing with well-isolated qubits. Numerous schemes for entanglement-by-measurement of solid-state qubits have been proposed8,9,10,11,12,13, but the demanding experimental requirements have so far hindered implementations. Here we realize a two-qubit parity measurement on nuclear spins localized near a nitrogen-vacancy centre in diamond by exploiting an electron spin as a readout ancilla. The measurement enables us to project the initially uncorrelated nuclear spins into maximally entangled states. By combining this entanglement with single-shot readout we demonstrate the first violation of Bell’s inequality with solid-state spins. These results introduce a new class of experiments in which projective measurements create, protect and manipulate entanglement between solid-state qubits.
Subfields: Artificial Intelligence, Electrical and Electronic Engineering, Materials Chemistry
View Paper: https://www.semanticscholar.org/paper/1432a58c1f95bac5c84a528bb211796aae291478
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Citations in the corpus
- Isolated Spin Qubits in SiC with a High-Fidelity Infrared Spin-to-Photon Interface (2017, unknown): “Such highly spin-dependent transitions can also be used to generate spin-photon entanglement, which is an essential precursor for remote entanglement mediated by photons [57].”
- A Ten-Qubit Solid-State Spin Register with Quantum Memory up to One Minute (2019, methodology): “To prepare nuclear-nuclear entanglement, we implement a probabilistic measurement-based scheme [62], as shown in Fig.”