Speaker
Description
Surface electrode ion traps are a promising platform for building quantum computers. In our cryogenic experiments, we encode qubit states in a first-order magnetic field insensitive hyperfine transition. The qubit control is implemented with microwave conductors that are integrated into the chip, following the microwave near-field approach, which reduces the number of lasers required.
To scale up the number of qubits, we need to commission more advanced chips, develop methods to significantly increase the number of electrical signals required for dense ion storage and transport zones on future chips, and need to develop more integrated laser access.
In one experiment, we are commissioning an 8-qubit chip with a qubit interaction zone in between two storage registers. All-to-all connectivity will be implemented through swapping operations combined with linear transport between the storage zones. An upcoming junction chip for several more ions is also going to be installed in a second experiment later this year.
In a third experiment, we are exploring hybrid-integrated cryogenic control electronics, such as integrated microwave sources and DACs for multiplexed ion shuttling. Reducing the number of cables entering the cryostat will reduce the conductive heat load and enable more advanced chip architectures.
A scalable system will inevitably require a larger chip size with dedicated zones for cooling and detecting ions. To enhance the laser access for larger chip sizes, we are preparing to upgrade a fourth experiment to use integrated waveguides in trap chips and report on the progress made towards this.
| Academic level | PhD student |
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