N. Linke

Publications75
h-index22
Citations3,281
Highly Influential Citations75
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High-Fidelity Preparation, Gates, Memory, and Readout of a Trapped-Ion Quantum Bit.
We implement all single-qubit operations with fidelities significantly above the minimum threshold required for fault-tolerant quantum computing, using a trapped-ion qubit stored in hyperfine "atomic…
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High-Fidelity Quantum Logic Gates Using Trapped-Ion Hyperfine Qubits.
We demonstrate laser-driven two-qubit and single-qubit logic gates with respective fidelities 99.9(1)% and 99.9934(3)%, significantly above the ≈99% minimum threshold level required for…
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Demonstration of a small programmable quantum computer with atomic qubits
TLDR
A five-qubit trapped-ion quantum computer that can be programmed in software to implement arbitrary quantum algorithms by executing any sequence of universal quantum logic gates, which provides the flexibility to implement a variety of algorithms without altering the hardware.
View on Nature
Full-Stack, Real-System Quantum Computer Studies: Architectural Comparisons and Design Insights
TLDR
This work has built the first top-to- bottom toolflow to target different qubit device technologies, including superconducting and trapped ion qubits which are the current QC front-runners, and demonstrates that leveraging microarchitecture details in the compiler improves program success rate.
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Experimental comparison of two quantum computing architectures
TLDR
It is shown that quantum algorithms and circuits that use more connectivity clearly benefit from a better-connected system of qubits, and suggested that codesigning particular quantum applications with the hardware itself will be paramount in successfully using quantum computers in the future.
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Complete 3-Qubit Grover search on a programmable quantum computer
TLDR
The authors perform the Grover quantum search algorithm on 3 qubits using trapped ions, demonstrating two methods for marking the correct result in the algorithm’s oracle and providing data for searches yielding 1 or 2 solutions.
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Verified quantum information scrambling
TLDR
A quantum circuit in an ion-trap quantum computer provides a positive test for the scrambling features of a given unitary process, and is implemented as part of a seven-qubit circuit on an ion trap quantum computer to experimentally bound the scrambling-induced decay of the corresponding OTOC measurement.
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Training of quantum circuits on a hybrid quantum computer
TLDR
This study trains generative modeling circuits on a quantum hybrid computer showing an optimization strategy and a resource trade-off and shows that the convergence of the quantum circuit to the target distribution depends critically on both the quantum hardware and classical optimization strategy.
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Implementation of a symmetric surface-electrode ion trap with field compensation using a modulated Raman effect
We describe a new electrode design for a surface-electrode Paul trap, which allows rotation of the normal modes out of the trap plane, and a technique for micromotion compensation in all directions…
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Generation of thermofield double states and critical ground states with a quantum computer
TLDR
This work generates nontrivial thermal quantum states of the transverse-field Ising model (TFIM) by preparing thermofield double states at a variety of temperatures and prepares the critical state of the TFIM at zero temperature using quantum–classical hybrid optimization.
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