High-fidelity trapped-ion qubit operations with scalable photonic modulators

Abstract

Experiments with trapped ions and neutral atoms typically employ optical modulators in order to control the phase, frequency, and amplitude of light directed to individual atoms. These elements are expensive, bulky, consume substantial power, and often rely on free-space I/O channels, all of which pose scaling challenges. To support many-ion systems like trapped-ion quantum computers or miniaturized deployable devices like clocks and sensors, these elements must ultimately be microfabricated, ideally monolithically with the trap to avoid losses associated with optical coupling between physically separate components. In this work we design, fabricate, and test an optical modulator capable of monolithic integration with a surface-electrode ion trap. These devices consist of piezo-optomechanical photonic integrated circuits configured as multi-stage Mach-Zehnder modulators that are used to control the intensity of light delivered to a single trapped ion on a separate chip. We use quantum tomography employing hundreds of multi-gate sequences to enhance the sensitivity of the fidelity to the types and magnitudes of gate errors relevant to quantum computing and better characterize the performance of the modulators, ultimately measuring single qubit gate fidelities that exceed 99.7%.

References in corpus (9)

• A microfabricated surface-electrode ion trap for scalable quantum information processing
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Cited by in corpus (9)

• Multi-site Integrated Optical Addressing of Trapped Ions
• Scalable, high-fidelity all-electronic control of trapped-ion qubits
• Extremely high extinction ratio electro-optic modulator via frequency upconversion to visible wavelengths
• Integrated photonic structures for photon-mediated entanglement of trapped ions
• Hybrid integrated near UV lasers using the deep-UV Al2O3 platform
• Optimal-order Trotter-Suzuki decomposition for quantum simulation on noisy quantum computers
• On-chip 7 GHz acousto-optic modulators for visible wavelengths
• Quantum dual extended Hamming code immune to collective coherent errors
• Low-Crosstalk, Silicon-Fabricated Optical Waveguides for Laser Delivery to Matter Qubits