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As it has been demonstrated that trapped ion systems have unmatchedlong-lived quantum-bit (qubit) coherence and can support high-fidelity quantummanipulations, how to scale up the system size becomes an inevitable task forpractical purposes. In this work, we theoretically analyse the physicallimitation of scalability with a trapped ion array, and propose a feasiblescheme of architecture that in principle allows an arbitrary number of ionqubits, for which the overhead only scales linearly with the system size. Thisscheme relies on the combined ideas of a trap architecture of tunable size,stabilisation of an ion crystal by optical tweezers, and continuous sympatheticcooling without touching the stored information. We demonstrate thatillumination of optical tweezers modifies the motional spectrum by effectivelypinning the ions, lifting the frequencies of the motional ground modes. Bydoing so, we make the structure of the array less vulnerable from thermalexcitations, and suppress the the position fluctuations to insure faithful gateoperations. Finally, we also explore the local behaviour of cooling when asub-array is isolated by optical tweezers from other parts of the crystal.

Scalable quantum computing stabilised by optical tweezers on an ion crystal