CN-224217115-U - Superconducting quantum chip and quantum computing equipment

CN224217115UCN 224217115 UCN224217115 UCN 224217115UCN-224217115-U

Abstract

The utility model discloses a superconducting quantum chip and quantum computing equipment. The superconducting quantum chip comprises an encapsulation box, a PCB and a superconducting quantum chip body, wherein the superconducting quantum chip body is stacked on the PCB, the superconducting quantum chip body and the PCB are encapsulated in the encapsulation box, the superconducting quantum chip body comprises a superconducting quantum circuit, the superconducting quantum circuit comprises a reading signal line, a plurality of superconducting resonant cavities, a plurality of quantum bits and a plurality of magnetic flux bias lines respectively connected with each quantum bit, the plurality of quantum bits are respectively coupled with the reading signal line through the superconducting resonant cavities, and when the magnetic flux bias lines are used for resetting the quantum bits, the magnetic flux bias lines transmit corresponding first frequency control signals to the quantum bits so as to adjust the frequency of the quantum bits to reach the resonance frequency of the encapsulation box to realize resonance with the encapsulation box. The utility model reduces hardware cost, saves chip layout area, reduces control complexity, and realizes quick and high-fidelity reset of quantum bits.

Inventors

Wang Caizeheng
ZOU HONGYANG
MENG TIEJUN
XIANG JINGEN

Assignees

深圳量旋科技有限公司

Dates

Publication Date: 20260508
Application Date: 20250423

Claims (10)

1. The superconducting quantum chip is characterized by comprising a packaging box, a PCB and a superconducting quantum chip body, wherein the superconducting quantum chip body is stacked on the PCB, and the superconducting quantum chip body and the PCB are packaged in the packaging box together; The superconducting quantum chip body comprises a superconducting quantum circuit, wherein the superconducting quantum circuit comprises a reading signal line, a plurality of superconducting resonant cavities, a plurality of quantum bits and a plurality of magnetic flux bias lines respectively connected with each quantum bit; The plurality of qubits are respectively coupled with the reading signal line through the connected superconducting resonant cavities; And the magnetic flux bias line is used for transmitting a corresponding first frequency control signal to the connected quantum bit under the condition that the quantum bit needs to be reset, so as to adjust the frequency of the quantum bit to reach the resonance frequency of the packaging box so as to realize resonance with the packaging box.
2. The superconducting quantum chip of claim 1, wherein the superconducting quantum chip body is disposed at a predetermined location on the PCB by soldering or bonding.
3. The superconducting quantum chip of claim 1, wherein the magnetic flux bias line is further configured to input a second frequency control signal to the qubit in a measurement state of the qubit, the second frequency control signal is configured to control the qubit to be at a preset operating frequency, a resonance frequency of the package box is smaller than a minimum value of a range of the operating frequency of the qubit, and a difference between the two frequencies is greater than or equal to a preset threshold, wherein the preset threshold is a minimum value of the difference between the two frequencies at which the package box and the qubit avoid resonance.
4. The superconducting quantum chip of claim 3 wherein a frequency difference between a minimum of an operating frequency of the qubit and a resonant frequency of the package itself is greater than 1GHz.
5. The superconducting quantum chip of claim 1, wherein the measuring operation and the resetting operation of the qubit are performed time-sharing, the superconducting resonator being activated in a measuring state of the qubit and not activated in a resetting state of the qubit.
6. The superconducting quantum chip of claim 3 wherein the first frequency control signal and the second frequency control signal are dc bias pulse signals.
7. The superconducting quantum chip of claim 1, wherein the length of the internal cavity of the enclosure is equal to an integer multiple of 1/2 of the wavelength of the electromagnetic wave.
8. The superconducting quantum chip of any one of claims 1-7, wherein the superconducting resonant cavity has a frequency range of 7GHz-7.5GHz, the maximum frequency of the qubit has a frequency range of 5GHz-5.5GHz, and the package resonant frequency is 3-4GHz.
9. The superconducting quantum chip of any one of claims 1-7, further comprising a plurality of XY lines; each XY line is connected with the qubit and is used for driving the qubit through microwave pulse.
10. A quantum computing device comprising the superconducting quantum chip of any one of claims 1-9.

Description

Superconducting quantum chip and quantum computing equipment Technical Field The utility model relates to the technical field of quantum information, in particular to a superconducting quantum chip and quantum computing equipment. Background Reset of a qubit (qubit) is one of the key operations in quantum computing, with the goal of restoring the qubit to a known initial state (e.g., the |0> state) for the accuracy of subsequent computations. Quick and high fidelity resetting of qubits is a key element in ensuring computational efficiency and reliability. The importance of a fast and accurate reset of qubits includes the following aspects: 1. the quick and accurate reset of the qubits is beneficial to improving the calculation efficiency and speed; 2. The quantum computing starting point requires that the quantum bit is in an accurate ground state, and the reset of the quantum bit can ensure the high fidelity of the initial state of the quantum bit; 3. Complex quantum algorithms and error correction are conveniently supported, and quantum error correction coding (such as surface codes) requires frequent measurement and resetting of auxiliary qubits. If the reset speed of the qubit is insufficient, the error correction period may exceed the coherence time of the qubit, resulting in information loss. For example, a fast parameter reset protocol (e.g., microwave driven approach) may enable sub-microsecond level operation without relying on qubit lifetime, providing a time window for dynamic error correction. 4. And the method is beneficial to promotion of expandability and practical application. Qubit reuse compilation techniques (e.g., intermediate circuit measurement and reset) allow a single physical qubit to simulate multiple logical bits, reducing hardware requirements. The feasibility of which depends on the efficient reset capability of the qubit. Methods of qubit reset in the prior art include traditional passive reset methods, relying on natural decay of the qubit to ground state (|0 >) by spontaneous emission or relaxation processes, which take longer (e.g., 100 μs) and are limited by the lifetime of the qubit and the system temperature, and possibly residual excited state errors, and in order to overcome the problems of the passive reset methods, the prior art has also developed a peltier (Purcell) effect enhanced reset method, which uses an additional resonator called a peltier resonator, uses a resonator of the same frequency for reading and resetting, has serious limitations, and requires a resonator frequency lower than the maximum qubit frequency, and is further compatible with popular transmon (transmission line shunted plasma oscillation qubit, transmission line parallel plasma oscillation qubit) qubit designs. Technologies compatible with popular transmon qubit designs also include microwave driven dissipation, quantum circuit refrigerator cooling methods, and the like. But these methods involve additional hardware costs and the control method is relatively complex. Disclosure of utility model The present utility model has been made in view of the above problems, and has as its object to provide a superconducting quantum chip and a quantum computing device which overcome or at least partially solve the above problems. In a first aspect, an embodiment of the present utility model provides a superconducting quantum chip, including a packaging box, a PCB, and a superconducting quantum chip body, where the superconducting quantum chip body is stacked on the PCB, and the superconducting quantum chip body and the PCB are packaged in the packaging box; The superconducting quantum chip body comprises a superconducting quantum circuit, a signal reading line, a plurality of superconducting resonant cavities, a plurality of quantum bits and a plurality of magnetic flux bias lines respectively connected with each quantum bit; The plurality of qubits are respectively coupled with the reading signal line through the connected superconducting resonant cavities; And the magnetic flux bias line is used for transmitting a corresponding first frequency control signal to the connected quantum bit under the condition that the quantum bit needs to be reset, so as to adjust the frequency of the quantum bit to reach the resonance frequency of the packaging box so as to realize resonance with the packaging box. In one embodiment, the superconducting quantum chip body is disposed at a preset position on the PCB by means of soldering or bonding. In one embodiment, the magnetic flux bias line is further configured to input a second frequency control signal to the qubit in a measurement state of the qubit, where the second frequency control signal is configured to control the qubit to be at a preset operating frequency, a resonance frequency of the package box is smaller than a minimum value of a range of the operating frequency of the qubit, and a difference between the two frequencies is greater than or equal to a pre