IEEE/LEOS Summer Topical Meetings

Visible-wavelength photonic integrated circuits for trapped-ion quantum computing

Karan K. Mehta, Gavin N. West, Rajeev J. Ram

Published Jul 1, 2017• 1 citation

Abstract

We report on work using visible integrated photonics to control trapped ions for quantum information processing. Planar radio frequency traps confine the ions while light is routed via visible waveguides and modulators and delivered to the ion by focusing grating couplers.

DOI: 10.1109/phosst.2017.8012635

Related papers

Utilizing integrated photonic technology for trapped-ion quantum computing

May E. Kim

Quantum Computing, Communication, and SimulationMar 13, 20240 citations

A visible-light integrated photonic platform for atomic systems

Suraj Bramhavar, Cheryl M. Sorace-Agaskar, Dave Kharas +7 more

Integrated Optics: Devices, Materials, and TechnologiesMar 4, 20194 citations

A broadband, individually addressing two- and three-dimensional photonic integrated circuit for trapped-ion qubit control

Daniel Klawson, Yiyang Zhi, Bingran You +21 more

quant-pharXiv:2607.25062Jul 29, 20260 citations

Integrated Optical Addressing of Ion Qubits with Waveguide-Based Focusing Gratings

Karan K. Mehta, Colin Bruzewicz, Robert McConnell +3 more

Waveguide optics integrated within planar ion traps can enable scalable addressing of atomic ions with diffraction-limited, focused beams. We discuss our experimental work on integrated optics based on such devices for large-scale trapped-ion quantum information processing.

Conference on Lasers and Electro-OpticsJan 1, 20170 citations

Integrated Visible Photonics for Trapped-Ion Quantum Computing

Dave Kharas, Cheryl M. Sorace-Agaskar, Suraj Bramhavar +4 more

Abstract : Abstract- A scalable trapped-ion-based quantum-computingarchitecture requires the capability tooptically address individual ions at severalwavelengths. We demonstrate a dual-layeredsilicon nitride photonic platform for integrationinto planar ion traps designed for trapped-ioncontrol in a 400 to 1100 nm wavelength range.

Jun 10, 20171 citation

Integrated optical control and enhanced coherence of ion qubits via multi-wavelength photonics

Robert Niffenegger, Jules Stuart, Cheryl M. Sorace-Agaskar +9 more

Jan 14, 20204 citations

IEEE/LEOS Summer Topical Meetings

Visible-wavelength photonic integrated circuits for trapped-ion quantum computing

Karan K. Mehta, Gavin N. West, Rajeev J. Ram

Published Jul 1, 2017• 1 citation

Publisher

Abstract

DOI: 10.1109/phosst.2017.8012635

Related papers

Utilizing integrated photonic technology for trapped-ion quantum computing

May E. Kim

Trapped-ion qubits have been advantageous in quantum information processing due to their long coherence times and high-fidelity state preparation, logic gate operation, and readout. In recent years, we have fabricated chips with electrodes – for generating the electric field for trapping ions – and photonic waveguides and grating out-couplers – for delivering light to the ions. The integrated photonics can potentially lower the laser power requirement and lead to faster gates; however, there are challenges that need to be overcome for the platform to be beneficial. Here, we demonstrate single and two qubit gates with Sr+ trapped ion qubits, driven by delivering light to the ions both via free space and integrated photonics. We show that robust quantum logic is within reach using the integrated photonic platform, and the approaches we are taking in mitigating current challenges.Trapped-ion qubits have been advantageous in quantum information processing due to their long coherence times and high-fidelity state preparation, logic gate operation, and readout. In recent years, we have fabricated chips with electrodes – for generating the electric field for trapping ions – and photonic waveguides and grating out-couplers – for delivering light to the ions. The integrated photonics can potentially lower the laser power requirement and lead to faster gates; however, there are challenges that need to be overcome for the platform to be beneficial. Here, we demonstrate single and two qubit gates with Sr+ trapped ion qubits, driven by delivering light to the ions both via free space and integrated photonics. We show that robust quantum logic is within reach using the integrated photonic platform, and the approaches we are taking in mitigating current challenges.

Quantum Computing, Communication, and SimulationMar 13, 20240 citations

A visible-light integrated photonic platform for atomic systems

Suraj Bramhavar, Cheryl M. Sorace-Agaskar, Dave Kharas +7 more

We demonstrate an integrated photonic platform for control of complex atomic systems. The platform includes multiple waveguide layers and a suite of passive photonic circuit components supporting a wavelength range from 370-1100 nm. In particular, we demonstrate a novel dual-layer vertical grating coupler used for efficiently directing visible light to precise positions above the chip surface. These circuits are compatible with traditional CMOS fabrication techniques and are well suited for improving the scalability of quantum information processing systems based on trapped-ion technology. A chip-scale waveguide platform at visible wavelengths could also prove useful in a variety of bio-photonic and sensing applications requiring precise light delivery or readout in a compact footprint.We demonstrate an integrated photonic platform for control of complex atomic systems. The platform includes multiple waveguide layers and a suite of passive photonic circuit components supporting a wavelength range from 370-1100 nm. In particular, we demonstrate a novel dual-layer vertical grating coupler used for efficiently directing visible light to precise positions above the chip surface. These circuits are compatible with traditional CMOS fabrication techniques and are well suited for improving the scalability of quantum information processing systems based on trapped-ion technology. A chip-scale waveguide platform at visible wavelengths could also prove useful in a variety of bio-photonic and sensing applications requiring precise light delivery or readout in a compact footprint.

Integrated Optics: Devices, Materials, and TechnologiesMar 4, 20194 citations

A broadband, individually addressing two- and three-dimensional photonic integrated circuit for trapped-ion qubit control

Daniel Klawson, Yiyang Zhi, Bingran You +21 more

Trapped ions provide a high-fidelity platform for quantum information processing, yet delivery of multiple, distinct wavelengths across large networks of interaction zones remains a bottleneck. Conventional free-space light delivery lacks scalability, while on-chip grating couplers suffer from narrow operational bandwidth that increases circuit footprint and optical interfacing complexity. Here we show a broadband photonic integrated circuit capable of addressing individual ions. The circuit combines a planar waveguide lens with a micromirror fabricated using two-photon polymerization at wafer scale. This implementation can address three individual ions from $λ$ = 405 - 880 nm with -27 dB average intensity crosstalk at $5\,μ\mathrm{m}$ pitch. We trap $^{40}\mathrm{Ca}^{+}$ and $^{138}\mathrm{Ba}^{+}$ ions above such devices, characterize optical crosstalk with barium ions, and demonstrate individual repumping of calcium ions. This monolithic photonic architecture brings broadband addressing in an on-chip modality to trapped-ion technology. More generally, integrating additive manufacturing into quantum devices is poised to unlock expanded design space for implementing novel quantum architectures.Trapped ions provide a high-fidelity platform for quantum information processing, yet delivery of multiple, distinct wavelengths across large networks of interaction zones remains a bottleneck. Conventional free-space light delivery lacks scalability, while on-chip grating couplers suffer from narrow operational bandwidth that increases circuit footprint and optical interfacing complexity. Here we show a broadband photonic integrated circuit capable of addressing individual ions. The circuit combines a planar waveguide lens with a micromirror fabricated using two-photon polymerization at wafer scale. This implementation can address three individual ions from $λ$ = 405 - 880 nm with -27 dB average intensity crosstalk at $5\,μ\mathrm{m}$ pitch. We trap $^{40}\mathrm{Ca}^{+}$ and $^{138}\mathrm{Ba}^{+}$ ions above such devices, characterize optical crosstalk with barium ions, and demonstrate individual repumping of calcium ions. This monolithic photonic architecture brings broadband addressing in an on-chip modality to trapped-ion technology. More generally, integrating additive manufacturing into quantum devices is poised to unlock expanded design space for implementing novel quantum architectures.

quant-pharXiv:2607.25062Jul 29, 20260 citations

Integrated Optical Addressing of Ion Qubits with Waveguide-Based Focusing Gratings

Karan K. Mehta, Colin Bruzewicz, Robert McConnell +3 more

Conference on Lasers and Electro-OpticsJan 1, 20170 citations

Integrated Visible Photonics for Trapped-Ion Quantum Computing

Dave Kharas, Cheryl M. Sorace-Agaskar, Suraj Bramhavar +4 more

Jun 10, 20171 citation

Integrated optical control and enhanced coherence of ion qubits via multi-wavelength photonics

Robert Niffenegger, Jules Stuart, Cheryl M. Sorace-Agaskar +9 more

Monolithic integration of control technologies for atomic systems presents a promising route to the development of quantum computers and portable quantum sensors. Trapped atomic ions form the basis of high-fidelity quantum information processors and high-accuracy optical clocks, but currently rely on free-space optics for ion control, limiting portability and scalability. Here we demonstrate a surface-electrode ion trap which delivers all wavelengths required for ionization, cooling, coherent operations, and quantum-state preparation and detection of Sr $^{+}$ qubits using integrated waveguides and grating couplers. Laser light from the violet to the infrared is coupled onto the chip via an optical-fiber array, creating an inherently stable optical path that we use to demonstrate qubit coherence resilient to platform vibrations. This demonstration of CMOS-compatible integrated-photonic surface-trap fabrication, robust packaging, and enhanced qubit coherence represents a key advance in the development of portable trapped-ion quantum sensors and clocks, and it lights the way toward the complete, individual control of larger numbers of ions in quantum information processing systems.Monolithic integration of control technologies for atomic systems presents a promising route to the development of quantum computers and portable quantum sensors. Trapped atomic ions form the basis of high-fidelity quantum information processors and high-accuracy optical clocks, but currently rely on free-space optics for ion control, limiting portability and scalability. Here we demonstrate a surface-electrode ion trap which delivers all wavelengths required for ionization, cooling, coherent operations, and quantum-state preparation and detection of Sr$^{+}$ qubits using integrated waveguides and grating couplers. Laser light from the violet to the infrared is coupled onto the chip via an optical-fiber array, creating an inherently stable optical path that we use to demonstrate qubit coherence resilient to platform vibrations. This demonstration of CMOS-compatible integrated-photonic surface-trap fabrication, robust packaging, and enhanced qubit coherence represents a key advance in the development of portable trapped-ion quantum sensors and clocks, and it lights the way toward the complete, individual control of larger numbers of ions in quantum information processing systems.

Jan 14, 20204 citations

λ

= 405 - 880 nm with -27 dB average intensity crosstalk at

5\,μ\mathrm{m}

pitch. We trap

^{40}\mathrm{Ca}^{+}

and

^{138}\mathrm{Ba}^{+}

ions above such devices, characterize optical crosstalk with barium ions, and demonstrate individual repumping of calcium ions. This monolithic photonic architecture brings broadband addressing in an on-chip modality to trapped-ion technology. More generally, integrating additive manufacturing into quantum devices is poised to unlock expanded design space for implementing novel quantum architectures.

^{+}

qubits using integrated waveguides and grating couplers. Laser light from the violet to the infrared is coupled onto the chip via an optical-fiber array, creating an inherently stable optical path that we use to demonstrate qubit coherence resilient to platform vibrations. This demonstration of CMOS-compatible integrated-photonic surface-trap fabrication, robust packaging, and enhanced qubit coherence represents a key advance in the development of portable trapped-ion quantum sensors and clocks, and it lights the way toward the complete, individual control of larger numbers of ions in quantum information processing systems.