Shared Quantum Circuit Refrigerators for Scalable Qubit Reset
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Solution Overview
Problem
Existing quantum computing systems face challenges in resetting qubits efficiently, particularly in cryogenically cooled environments, due to increasing heat load, physical space requirements, and scalability limitations.
Innovation Solution
A method and arrangement where a common control signal is used to simultaneously reset multiple qubits by activating one or more shared quantum circuit refrigerators, reducing the number of signal lines and heat load, and allowing for flexible hardware design.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If individual QCRs are provided for each qubit, then each qubit can be reset independently, but the number of signal lines and QCRs increases linearly with the number of qubits, increasing heat load and device complexity
Solution Approach 1:
Multiple individual QCRs are merged into a single shared QCR that serves multiple qubits simultaneously. The shared QCR receives a common control signal and can reset any of the coupled qubits through photon-assisted single-electron tunneling, eliminating the need for separate control lines for each QCR while maintaining independent resetting capability.
Solution Approach 2:
The shared QCR is designed to perform multiple functions by coupling to multiple qubits through a common control signal line. A single QCR can selectively reset different qubits based on the control signal received, making the system more scalable and reducing the linear growth of control infrastructure.
2Ease of operation
If more signal lines are provided to control individual QCRs, then each QCR can be controlled independently, but the heat load on the cryostat increases due to more signal lines crossing from room temperature to cryogenic environment
Solution Approach 1:
Multiple separate control signal lines are merged into a single common control signal line that serves all QCRs. This consolidation dramatically reduces the number of thermal conduction paths from room temperature to the cryogenic environment, thereby reducing the heat load on the cryostat while maintaining the ability to control QCR operations.
3Reliability
If individual QCRs are used for each qubit, then resetting can be performed independently, but the physical space required and chip area increase
Solution Approach 1:
Multiple individual QCR components are merged into a single shared QCR unit that physically occupies less chip area and physical space than multiple separate QCRs. The shared QCR maintains independent resetting capability for multiple qubits through quantum coupling mechanisms while being more space-efficient.
4Productivity
If more QCRs are used to reset more qubits, then resetting capability increases, but manufacturing cost and cooling power requirements increase
Solution Approach 1:
A single shared QCR is designed to serve multiple qubits, providing universal resetting capability across the quantum computing system. This multi-functional approach increases resetting capacity without proportionally increasing manufacturing cost or cooling power requirements, as the infrastructure is shared rather than replicated for each qubit.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach simplifies the hardware implementation at the interface between room temperature and cryogenically cooled environments, reduces heat load on the cryostat, and enhances scalability by minimizing the number of quantum circuit refrigerators needed.
Implementation Method 1
Each quantum circuit refrigerator is configured to enable photon-assisted single-electron tunneling across the respective tunneling junction in response to a control signal received through the respective control input
Implementation Method 2
This single-electron tunneling requires energy, which is absorbed from the qubit in the form of a photon
Implementation Method 3
Superconducting chips are used in various applications such as quantum computing
Data Source
AI summary
A method, system, and arrangement for resetting qubits are disclosed. An example system includes one or more quantum circuit refrigerators for resetting qubits. Each of the quantum circuit refrigerators includes a tunneling junction and a control input for receiving a control signal. Photon-assisted single-electron tunneling takes place across the respective tunneling junction in response to a control signal. Capacitive or inductive coupling elements between the qubits and the quantum circuit refrigerators couple each qubit to the quantum circuit refrigerator(s). The qubits, quantum circuit refrigerators, and coupling elements are located in a cryogenically cooled environment. A common control signal line to the control inputs crosses into the cryogenically cooled environment from a room temperature environment.