Cryogenic Integration for Quantum Computer Using Diamond Color Center Spin Qubits
Toshiki Iwai (Fujitsu Limited)
Kenichi Kawaguchi (Fujitsu Limited)
T. Miyatake (Fujitsu Limited)
Tetsuro Ishiguro (Fujitsu Limited)
Shoichi Miyahara (Fujitsu Limited)
Yoshiyasu Doi (Fujitsu Limited)
Salahuddin Nur (TU Delft - QID/Ishihara Lab)
Ryoichi Ishihara (TU Delft - QID/Ishihara Lab, TU Delft - Quantum Circuit Architectures and Technology)
Shintaro Sato (Fujitsu Limited)
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Abstract
For quantum computing modules using diamond color centers, we propose an integrated structure of a quantum chip with photonic circuits and an interposer with electric circuits. The chip and interposer are connected via gold stud bumps using flip-chip bonding technology. For evaluating the proposed integrated structure, we bonded a test chip of 15 × 15 mm2, corresponding to the area that allows the allocation of color center qubits in the order of 102, with an interposer of 20 × 20 mm2, including test measurement lines. We confirm all connections of 16 lines with two bumps for each line at 10 K. The resistance of the lines with two bumps at 10 K is ~ 3.5O, These resistances are mainly attributed to the gold lines on the interposer, which is confirmed by simulations. The shear strength of the flip-chip bonded structure is 67 g/bump. It is larger than that of previous reports where the chips passed the standard temperature cycle test. Moreover, we integrate the flip-chip bonded structure with a printed circuit board (PCB). We confirm a connection between the connector terminal of the PCB and the test chip at 80 K. It is shown that the integrated structure using gold stud bumps has a potentially highly reliable connection at cryogenic temperature. These results will lead to realizing large-scale diamond spin quantum processors.