Superconducting quantum bit chip

Abstract

The invention discloses a superconducting quantum bit chip, comprising a quasi-one-dimensional network chain structure layout superconducting quantum bit array and a manipulating and reading microwavecircuit, wherein each mesh unit comprises n qubits, and m (m and n are natural numbers, n>m>=2) shared qubits between adjacent networks are used for interconnection between mesh units; Each superconducting qubit in the mesh unit is coupled to the same coplanar superconducting microwave cavity for interconnection of qubits in the network. Each qubit is coupled to a coplanar superconducting microwave cavity and further coupled to a coplanar microwave transmission line, and is connected to an external circuit for qubit state reading. The present application can effectively prevent the possibility of qubit interconnection breakpoints, greatly improve interconnection reliability, increase the flexibility of error correction coding design, effectively reduce the complexity of qubit manipulationand reading circuits, and has an important scientific research and industrial application prospect.

Description

technical field [0001] The present invention relates to but not limited to the technical field of superconducting quantum computing, in particular to a superconducting qubit chip. Background technique [0002] A quantum computer is a device that uses quantum logic to perform general-purpose computing. Compared with traditional computers, quantum computers can greatly reduce the calculation time when solving important specific problems, so they have attracted wide attention. The core of a quantum computer is a quantum chip composed of a large number of interacting qubits. [0003] Quantum chips based on superconducting materials can use existing semiconductor process technology to achieve large-scale integration. Superconducting qubits show key indicators for quantum computing such as interaction control, selective operation, and error correction. It is one of the most promising platforms for realizing quantum computers because of its superior performance compared with othe...

AI Technical Summary

Problems solved by technology

Attached Figure 1(a) is a one-dimensional qubit layout (such as Google, Rigetti Computing and other companies recently adopted), in which adjacent qubits are directly coupled to each other, and another dimension in the chip plane can be used to control qubit manipulation and state reading. The relevant circuit is taken. The quantum circuit of this layout is simple and intuitive, but the reliability of qubit interconnection is low. Once a qubit in the link fails, the pairwise coupling between qubits will be broken. Therefore, this Quantum chips are less fault-tolerant

Attached Figure 1(b) is a two-dimensional layout of qubits (the scheme planned by IBM, Intel and other companies), also known as surface code (surface code), its advantage is that the quantum chip has relatively high fault tolerance and can run quantum Error correction algorithm, but the chip circuit complexity of this qubit layout is very high, there is still the possibility of qubit interconnection breakpoints, and the control and reading circuits need to be wired in the third dimension to complete the interconnection, which requires a three-dimensional integrated circuit, thus The chip manufacturing process is extremely complicated, which affects the reliability of the chip

[0006] It is foreseeable that for quantum chips using the above two architectures, as the number of superconducting qubits increases, the demand for control line layout, signal cross-effects, and microwave equipment required to fully control the qubits will also show rapid growth. This will undoubtedly become a constraint for the realization of large-scale quantum computers

Images