Pseudo-2D superconducting quantum computing circuit for the surface code: proposal and preliminary tests

Abstract

Among the major hardware platforms for large-scale quantum computing, one of the leading candidates is superconducting quantum circuits. Current proposed architectures for quantum error-correction with the promising surface code require a two-dimensional layout of superconducting qubits with nearest-neighbor interactions. A major hurdle for the scalability in such an architecture using superconducting systems is the so-called wiring problem, where qubits internal to a chipset become difficult to access by the external control/readout lines. In contrast to the existing approaches which address the problem through intricate three-dimensional wiring and packaging technology, leading to a significant engineering challenge, here we address this problem by presenting a modified microarchitecture in which all the wiring can be realized through a newly introduced pseudo two-dimensional resonator network which provides the inter-qubit connections via airbridges. Our proposal is completely compatible with current standard planar circuit technology. We carried out experiments to examine the feasibility of the new airbridge component. The measured quality factor of the airbridged resonator is below the simulated surface-code threshold required for a coupling resonator, and it should not limit simulated gate fidelity. The measured crosstalk between crossed resonators is at most −49 dB in resonance. Further spatial and frequency separation between the resonators should result in relatively limited crosstalk between them, which would not increase as the size of the chipset increases. This architecture and the preliminary tests indicate the possibility that a large-scale, fully error-corrected quantum computer could be constructed by monolithic integration technologies without additional overhead or special packaging know-how.

Magnetic-free traveling-wave nonreciprocal superconducting microwave components

“…In general, to make the forward and backward waves see identical input impedance, a symmetric design of the unit cell of the coupled CRLH TLs is adopted and shown in Fig. 8 [55,56], which is not illustrated in Fig. 8(b).…”

Ultrastrong tunable coupler between superconducting LC resonators

“…The superconducting quantum circuit is one of the most outstanding platforms for quantum information processing and quantum sensing devices [1][2][3], and several important results have been reported in recent years [4][5][6]. These achievements are supported by the high degree of freedom in the design of Josephson junctions as nonlinear components and the fabrication technologies that have been developed in the field of semiconductors [7,8].…”

Robust entanglement of an asymmetric quantum dot molecular system in a Josephson junction

“…Moreover, superconducting devices have found impressive interest in quantum information setups [29] , [30] because of their long intrinsic coherency with no dissipation characteristics. Recent years, employing the superconducting qubits and superconducting resonators have improved the exploring of quantum entanglement [31] , [32] , quantum teleportation [33] , [34] and quantum computing [35] , [36] studies. Superconducting qubits namely phase [37] , flux [38] and charge [39] qubits can be connected with microwave [40] , electrical [41] , mechanical [42] , and superconducting [43] resonators.…”