Tunable Frequency Bus Layout for Collision-Free Qubit Coupling
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Solution Overview
Problem
Current superconducting quantum computers face challenges with frequency collisions and crosstalk when using Cross-Resonance (CR) to couple qubits, particularly in larger quantum computer setups where qubits are closely spaced in frequency, limiting the ability to establish coupling between farther away qubits effectively.
Innovation Solution
The implementation of a quantum computing device with a combination of qubits having different resonance frequencies and corresponding fixed and tunable frequency buses, allowing for cross-resonance interactions while preventing frequency collisions and crosstalk, using a configuration where qubits with different resonance frequencies are arranged in specific patterns and coupled via fixed and tunable frequency buses to enable efficient qubit interactions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If qubits are closely spaced in frequency to enable Cross-Resonance interaction, then coupling between qubits is established, but frequency collisions and crosstalk occur
Solution Approach 1:
The patent applies dynamics by making the bus frequency tunable rather than fixed. The bus can dynamically adjust its frequency to match either the first frequency (for coupling first qubits) or the second frequency (for coupling second qubits), allowing the system to adapt its coupling characteristics in real-time and eliminate frequency collisions
Solution Approach 2:
The patent changes the frequency parameter of the bus from a fixed value to a variable that can be tuned between two distinct frequencies. This parameter change enables selective coupling to different qubit groups without causing frequency collisions, as the bus frequency can be set to match only the intended target qubits at any given time
2Ease of operation
If fixed frequency buses are used for cross-resonance coupling, then nearest neighbor interactions are enabled, but coupling between farther away qubits is limited
Solution Approach 1:
The patent makes the bus multi-functional by enabling it to couple to different qubit groups at different frequencies. The same bus can serve as a coupling medium for first qubits at one frequency and for second qubits at another frequency, allowing both nearest-neighbor and farther-away qubit coupling through a single versatile component
Solution Approach 2:
The tunable bus acts as an intermediary that can mediate interactions between different qubit groups. By tuning to the appropriate frequency, the bus enables indirect coupling between qubits that are not directly adjacent, extending the interaction range beyond nearest-neighbor limitations
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 configuration effectively reduces frequency collisions and crosstalk, enabling reliable and efficient interactions between qubits, even at greater distances, thereby enhancing the coherence and operational stability of the quantum computing device.
Implementation Method 1
the first plurality of qubits being configured to interact via cross-resonance through the first fixed frequency bus
Implementation Method 2
a first tunable frequency bus configured to couple at least one of the first plurality of qubits to the second qubit
Data Source
AI summary
A quantum computing device including a first plurality of qubits having a first resonance frequency and a second qubit having a second resonance frequency, the second resonance frequency being different from the first resonance frequency; and a first tunable frequency bus configured to couple the first plurality of qubits to the second qubit.