Quantum Bit Array Layout for High-Density Qubit Access
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Solution Overview
Problem
The challenge in quantum computing is the limited control structures used to access qubits in a quantum bit array, which hinders the construction of large and powerful arrays due to the need for closely spaced qubits and the complexity of integrating decoder circuits.
Innovation Solution
The implementation of a quantum bit array with control structures such as control gates, pass gates, bit lines, word lines, and capacitors, allowing for precise control and operation of qubits through voltage applications, enabling efficient access and operation of qubits in a high-density array.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If qubits are spaced very closely together to construct large quantum bit arrays, then the density and power of the quantum system is improved, but the complexity of control structures and decoder circuits increases
Solution Approach 1:
The patent transitions from planar control structures to three-dimensional vertical transistor channels that extend through multiple layers. Word lines and bit lines are arranged in different vertical levels, allowing control signals to reach qubits through the third dimension. This spatial reorganization reduces the complexity of control structures while maintaining high qubit density.
Solution Approach 2:
The vertical transistor channels serve multiple functions: they act as control gates for qubit operations, serve as interconnect pathways for control signals, and provide structural support for the multi-layer architecture. This multi-functionality reduces the number of separate control structures needed, thereby reducing overall system complexity.
2Ease of operation
If traditional control structures are used to access qubits, then the device structure is simple, but the ability to access and control qubits in high-density arrays is limited
Solution Approach 1:
The control structure is segmented into multiple independent vertical transistor channels, each capable of controlling individual qubits or small groups of qubits. This segmentation allows for selective access to specific qubits without interfering with others, greatly improving ease of operation in high-density arrays while keeping each individual control element relatively simple.
Solution Approach 2:
The vertical transistor channels act as intermediary elements between the planar word/bit lines and the qubits located in different vertical levels. These intermediaries enable control signals to be transmitted efficiently through the three-dimensional structure, improving qubit access capability without requiring direct complex connections between every control line and 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 solution allows for the construction of very large and powerful quantum bit arrays with precise control over qubit operations, enhancing the performance and density of quantum computing systems.
Implementation Method 1
a capacitor coupled to selectively store charge in the first transistor channel
Implementation Method 2
The at least one word line selectively controls charge flow through the first transistor channel
Data Source
AI summary
A quantum bit array is disclosed. In an embodiment, the quantum bit array includes a control gate coupled to a qubit and at least one pass gate coupled between the qubit and an adjacent qubit to control operation of the qubit of the quantum bit array, a bit line, and a first transistor channel that connects the bit line to the control gate. The array further comprises at least one word line coupled to the first transistor channel. The at least one word line selectively controls charge flow through the first transistor channel. The array further comprises a capacitor coupled to selectively store charge in the first transistor channel.