Easy-to-expand and high-fidelity superconducting quantum chip structure and operation method
A superconducting quantum, high-fidelity technology, applied in quantum computers, semiconductor devices, instruments, etc., can solve the problems of slow thermal operation, control signal crosstalk, serious parasitic coupling, etc., and achieve small parasitic coupling and special modulation signals. The effect of small crosstalk and long decoherence time
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Embodiment 1
[0048] Such as Figure 1(a) ~ Figure 1(d) As shown, the present invention proposes an easily expandable, high-fidelity superconducting quantum chip structure, the superconducting quantum chip includes several adjustable couplers (marked as "C" in the figure) and fixed frequency and designed at Several qubits (labeled "Q" in the figure) of different frequency bands. Among them, qubits and adjustable couplers are arranged alternately, and the static frequency of the adjustable coupler, adjacent qubits, and frequencies of qubits adjacent to the same adjustable coupler are all in different frequency bands; each quantum Each bit is provided with a separate microwave drive line XY, and any single-bit gate can be realized by applying a resonant excitation signal on the microwave drive line XY; each adjustable coupler is provided with a separate magnetic flux bias line Z, through By applying a frequency-modulated signal on the flux bias line Z, a two-bit gate or an arbitrary multi-bi...
Embodiment 2
[0079] Such as Figure 2 ~ Figure 4 As shown, this embodiment explains part of the present invention in more detail; this embodiment belongs to a special situation in the first embodiment.
[0080] Such as figure 2 Shown is a schematic diagram of a one-dimensionally arranged superconducting quantum chip and the corresponding control circuit. In the superconducting quantum chip, qubits and adjustable couplers are arranged in a ratio of 1:1. Among them, both the qubit and the adjustable coupler adopt the transmission sub-qubit structure. The transmission sub-qubit is formed by parallel connection of a Josephson junction (or superconducting quantum interference device) and a large capacitor. The parallel capacitor is composed of a flat plate to the ground. The typical value of the parallel capacitance is 70-100fF, and the typical value of the critical current of the Josephson junction is 20nA; the superconducting quantum interference device in the adjustable coupler is composed ...
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