14-Qubit entanglement: creation and coherence.

By Thomas Monz, Philipp Schindler, J. Barreiro, M. Chwalla, Daniel Nigg, W. Coish, M. Harlander, W. Hänsel, M. Hennrich, Rainer Blatt. Physical Review Letters, 2010

986 citations recorded by the source corpus.

We report the creation of Greenberger-Horne-Zeilinger states with up to 14 qubits. By investigating the coherence of up to 8 ions over time, we observe a decay proportional to the square of the number of qubits. The observed decay agrees with a theoretical model which assumes a system affected by correlated, Gaussian phase noise. This model holds for the majority of current experimental systems developed towards quantum computation and quantum metrology.

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

View Paper: https://www.semanticscholar.org/paper/dd6c84af4d4757438ae187fd629399b48f39b65b

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Citations in the corpus

A Ten-Qubit Solid-State Spin Register with Quantum Memory up to One Minute (2019, background): “Characterizing such correlated noise provides new opportunities to investigate the physics of decoherence in spin baths [67] and to develop and test quantum-error-correction schemes that are tailored for specific correlated noise [70,71].”
Demonstration of qubit operations below a rigorous fault tolerance threshold with gate set tomography (2016, background): “Trapped ions are among the most reliable qubits available today; up to 14 qubits have been addressed in a single trap [13], a 5-qubit quantum information processor has been realized [14], and single-qubit gates have demonstrated randomized benchmarking infidelities as low as 10−6 [15–17].”
Quantum information processing with superconducting circuits: a review (2016, methodology): “The state of the art of (iii) is currently defined by an iontrap experiment entangling 14 qubits via a Mølmer–Sørensen (MS) gate [268].”
Entanglement in a Quantum Annealing Processor (2014, neutral): “[10] T.”
Natural and artificial atoms for quantum computation (2010, background): “Entangled (Greenberger–Horne–Zeilinger (GHZ) and W) states of up to 14 qubits have been realized [51, 52, 64].”
Ultra-large-scale continuous-variable cluster states multiplexed in the time domain (2013, background): “Previously, the largest cluster state consisted of 8 photonic qubits [5] or light modes [6], while the largest multipartite entangled state of any sort involved 14 trapped ions [7].”
Logical quantum processor based on reconfigurable atom arrays (2023, background): “The GHZ state studied here provides such an example, as conventional parity-oscillation measurements cannot be performed 84 .”
Analysis of imperfections in the coherent optical excitation of single atoms to Rydberg states (2018, background): “Recent experimental efforts have shown an improvement in the fidelities of two-qubit gates [25,26], but they still remain below their theoretically predicted intrinsic fidelities [27,28] as compared to other experimental platforms, such as trapped ions [29,30] or superconducting qubits [31– 33].”
Quantum trajectories and open many-body quantum systems (2014, positive): “In the sense of continuous measurement theory [19] applied to (2), the resulting state prepared is”
Macroscopic quantum states: Measures, fragility, and implementations (2017, background): “(4)) with up to 14 ions (Monz et al., 2011) have been created.”