In the fields of quantum computing and atomic clocks different technologies are competing to provide the best performances in terms of gate fidelity, coherence, and number of qubits. In this landscape, three-dimensional fabrication technologies bring an added value allowing more complex but precise electrode arrangements ideal for ion trapping.
In this research, we present two 3D monolithic Paul traps produced in fused silica with femtosecond selective laser etching techniques, combined with metal coating. Monolithic design ensures intrinsic alignment of the trap electrodes down to the micron, being all produced in a single fabrication step. Precise alignment, combined with three-dimensional electrode arrangement, creates a disruptive advantage for quantum devices’ architecture. We will showcase the performance benchmarks of our traps, including the heating rate and trap harmonicity, using laser-cooled chains of Calcium ions.
Atomic ions controlled by laser light are among the leading candidates for large scale quantum computing. However operational systems today require vast scaling to reach levels capable of useful computational tasks. The integration of light delivery will be an essential component of this for the trapped-ion approach. I will describe results in which the use of photonics integrated into ion trap chips has allowed us to perform high fidelity two-qubit gates, which are an essential building block for quantum computers. These systems have now been extended to the operation of multiple trap zones, and the creation of novel optical fields for ion trap control while a new generation of chips allowing integration of all required wavelengths as well as optimised light delivery offers further enhancements in performance and scaling.
Trapped-ion qubits promise certain fundamental advantages for quantum information processing (QIP), owing to their indistinguishability and relatively high isolation from noisy environments. Though these qualities have allowed demonstrations of the necessary primitives for quantum computation, the complexity of the optical apparatus required is a major impediment to implementation at scales where quantum systems offer a clear advantage over classical computers. Here, we build on previous work with trap-integrated waveguide optics, describing designs and simulations for commercial foundry-fabricated ion trap chips with integrated Si3N4 waveguides and grating couplers to implement multi-qubit operations. We detail a design intended to address and implement quantum logic gates between 5 ions in a single register, and a configuration which utilizes the stable on-chip path lengths of waveguide devices to enact a novel fast entangling two-qubit gate. The devices and approaches presented here could form elements of a scalable architecture for trapped-ion QIP.
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