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CN-122021957-A - Quantum chip, quantum bit interconnection circuit and control method thereof

CN122021957ACN 122021957 ACN122021957 ACN 122021957ACN-122021957-A

Abstract

The invention discloses a quantum chip, a quantum bit interconnection circuit and a control method thereof, belonging to the field of quantum computing, wherein the quantum bit interconnection circuit comprises: the device comprises a first quantum bit, a second quantum bit and a coupling device for coupling the first quantum bit and the second quantum bit, wherein the first quantum bit and the second quantum bit are arranged on bit layers of a quantum chip, the first quantum bit and the second quantum bit are positioned on different areas of the bit layers, the frequency of the coupling device is adjustable, the coupling device is arranged on a circuit connecting layer of the quantum chip, and the bit layers and the circuit connecting layer are coupled together through silicon through holes. The quantum bit interconnection circuit can increase the number of deployed quantum bits on the quantum chip on the basis of not increasing wiring difficulty.

Inventors

  • LI YONG

Assignees

  • 山东云海国创云计算装备产业创新中心有限公司

Dates

Publication Date
20260512
Application Date
20260228

Claims (10)

  1. 1. The quantum bit interconnection circuit is characterized by comprising a first quantum bit, a second quantum bit and a coupling device for coupling the first quantum bit and the second quantum bit, wherein the first quantum bit and the second quantum bit are arranged on bit layers of a quantum chip, the first quantum bit and the second quantum bit are positioned on different areas of the bit layers, the frequency of the coupling device is adjustable, the coupling device is arranged on a circuit connection layer of the quantum chip, and the bit layers and the circuit connection layer are coupled together through a through silicon via.
  2. 2. The qubit interconnect circuit of claim 1 wherein the coupling device is embodied as a frequency-tunable resonant cavity and the frequency of the resonant cavity is frequency tuned by a superconducting quantum interferometer within the resonant cavity.
  3. 3. A qubit interconnect circuit according to claim 1 wherein the different regions on the bit layer are divided according to a maximum number of qubit yields.
  4. 4. The qubit interconnect circuit of claim 1 wherein the first qubit and the second qubit are identical in structure and wherein superconducting quantum interferometers are provided in both the first qubit and the second qubit.
  5. 5. The qubit interconnect circuit of claim 4 wherein a first flux control line for adjusting the frequency of the first qubit is disposed on a routing layer of the quantum chip and a second flux control line for adjusting the frequency of the second qubit is disposed on the routing layer.
  6. 6. The qubit interconnect circuit of claim 5 wherein the first flux control line and the first qubit are positioned to overlap each other in a perpendicular projection direction and the second flux control line and the second qubit are positioned to overlap each other in a perpendicular projection direction.
  7. 7. A quantum chip comprising a qubit interconnect circuit as claimed in any one of claims 1 to 6.
  8. 8. A method of controlling a qubit interconnect circuit according to any one of claims 1 to 6, comprising: adjusting the frequency of the coupling device; performing a bit gating operation on a first qubit and a second qubit when an effective coupling strength between the first qubit and the second qubit is non-zero and a remaining coupling strength between the first qubit and the second qubit is zero.
  9. 9. The method of claim 8, wherein the performing a bit gate operation on the first qubit and the second qubit when the effective coupling strength between the first qubit and the second qubit is non-zero and the remaining coupling strength between the first qubit and the second qubit is zero comprises: Determining a mathematical expression corresponding to the effective coupling strength between the first quantum bit and the second quantum bit to obtain an effective coupling strength model; creating a data change graph corresponding to the effective coupling strength model to obtain an effective coupling strength change graph; Determining the frequency corresponding to the coupling device when the effective coupling strength between the first quantum bit and the second quantum bit is non-zero based on the effective coupling strength change diagram, so as to obtain a first frequency set; Determining a mathematical expression corresponding to the residual coupling strength between the first quantum bit and the second quantum bit to obtain a residual coupling strength model; Creating a data change graph corresponding to the residual coupling strength model to obtain a residual coupling strength change graph; Determining the frequency corresponding to the coupling device when the residual coupling strength between the first quantum bit and the second quantum bit is zero based on the residual coupling strength change diagram, so as to obtain a second frequency set; Obtaining an intersection of the first frequency set and the second frequency set to obtain a target frequency intersection; Setting the frequency of the coupling device according to the target frequency intersection, and performing bit gate operation on the first quantum bit and the second quantum bit.
  10. 10. The method for controlling a qubit interconnection circuit according to claim 9, wherein determining a mathematical expression corresponding to a residual coupling strength between the first qubit and the second qubit to obtain a residual coupling strength model includes: And determining a target Hamiltonian amount corresponding to the quantum bit interconnection circuit, and determining a mathematical expression corresponding to the residual coupling strength between the first quantum bit and the second quantum bit according to the target Hamiltonian amount to obtain the residual coupling strength model.

Description

Quantum chip, quantum bit interconnection circuit and control method thereof Technical Field The invention relates to the field of quantum computing, in particular to a quantum chip, a quantum bit interconnection circuit and a control method thereof. Background Superconducting quantum computers are one of the hot schemes for realizing quantum computation, as carriers for quantum information processing, superconducting qubits are already deployed in some complex quantum processors, and a plurality of qubits are required to be deployed on a quantum chip in order to realize more complex algorithm demonstration. In the related art, in order to integrate large-scale qubits on a quantum chip, it is common to develop a single quantum chip as a whole and to stack physical elements such as qubits, couplers and connection lines on the surface of the quantum chip to increase the number of integrated qubits on the quantum chip, but such a design architecture requires a high-difficulty processing process and complicated wiring to accomplish. Currently, there is no more effective solution to this technical problem. Therefore, how to increase the number of deployed qubits on the quantum chip without increasing the wiring difficulty is a technical problem to be solved by those skilled in the art. Disclosure of Invention The invention aims to provide a quantum chip, a quantum bit interconnection circuit and a control method thereof, which are used for solving the technical problems of complex processing technology and higher wiring difficulty when the number of quantum bits is expanded on the quantum chip at present. In order to solve the technical problems, the invention provides a quantum bit interconnection circuit which comprises a first quantum bit, a second quantum bit and a coupling device for coupling the first quantum bit and the second quantum bit, wherein the first quantum bit and the second quantum bit are arranged on bit layers of a quantum chip, the first quantum bit and the second quantum bit are positioned on different areas of the bit layers, the frequency of the coupling device is adjustable, the coupling device is arranged on a circuit connection layer of the quantum chip, and the bit layers and the circuit connection layer are coupled together through a through silicon via. In one aspect, the coupling device is specifically a resonant cavity with adjustable frequency, and the frequency of the resonant cavity is adjusted by a superconducting quantum interferometer in the resonant cavity. On the other hand, the different regions on the bit layer are divided according to the maximum number of quantum bit yield. On the other hand, the first qubit and the second qubit have the same structure, and superconducting quantum interferometers are arranged in the first qubit and the second qubit. On the other hand, a first magnetic flux control line for adjusting the frequency of the first qubit is provided on the wiring layer of the quantum chip, and a second magnetic flux control line for adjusting the frequency of the second qubit is provided on the wiring layer. On the other hand, the positions of the first magnetic flux control line and the first qubit overlap each other in the perpendicular projection direction, and the positions of the second magnetic flux control line and the second qubit overlap each other in the perpendicular projection direction. In order to solve the technical problem, the invention also provides a quantum chip, which comprises a quantum bit interconnection circuit as disclosed in the foregoing. In order to solve the above technical problems, the present invention further provides a method for controlling a qubit interconnection circuit, which is applied to the above disclosed qubit interconnection circuit, and includes: adjusting the frequency of the coupling device; performing a bit gating operation on a first qubit and a second qubit when an effective coupling strength between the first qubit and the second qubit is non-zero and a remaining coupling strength between the first qubit and the second qubit is zero. In one aspect, the bit gating the first qubit and the second qubit when an effective coupling strength between the first qubit and the second qubit is non-zero and a remaining coupling strength between the first qubit and the second qubit is zero comprises: Determining a mathematical expression corresponding to the effective coupling strength between the first quantum bit and the second quantum bit to obtain an effective coupling strength model; creating a data change graph corresponding to the effective coupling strength model to obtain an effective coupling strength change graph; Determining the frequency corresponding to the coupling device when the effective coupling strength between the first quantum bit and the second quantum bit is non-zero based on the effective coupling strength change diagram, so as to obtain a first frequency set; Determining a mathematical expression