Many-Qubit Arrays for Analog and Digital-Analog Quantum Simulation

In recent years, superconducting qubit technology has advanced to the point that it is becoming useful for noisy intermediate-scale quantum (NISQ) applications. Of this, much interest has been directed towards the utility of this platform for analog bosonic and hybrid digital-analog simulation for application-specific Hamiltonians. Superconducting qubit designs for quantum simulation offer advantages over other modalities, such as ion traps and neutral atoms, due to the ease of individual control and the broad tunability of qubit frequencies and couplings [1]. Superconducting circuit-based quantum simulation is also particularly advantageous for open quantum systems as it can be engineered to simulate coupling to a particular environment [2]. Advances in 3D integration of low-loss superconducting circuits compatible with high quality qubits has enabled development of increasingly large 2D transmon arrays [3]. The native coupling of these qubits is extremely well-suited to simulating the Bose-Hubbard model, permitting the study of a large range of mesoscale condensed matter physics. Even small-scale simulations of these systems, on the order of a currently fabricable 6x6 qubit grid, exceed the capabilities of classical computation. Further, these qubit arrays can be used to create multi-photon entangled states when strongly coupled to 1D superconducting waveguides [4]. This entanglement can then be distributed to multiple qubits using artificial giant atoms that allow the qubit-waveguide coupling to be tuned dynamically [5]. The coherent preparation of many-body entangled states in this way may permit simulation of non-local interactions as well as fermionic coupling to bosonic continua.

The radiation-resistance of graphene combined with the EFLG’s robustness to energetic fluctuation makes these devices strong candidates for computing in space environments, greatly increasing the processing power available for flight computing.

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