Multiplexed RIP Gate Drive Line With Resonator Filtering
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Solution Overview
Problem
The existing methods for controlling resonator-induced phase (RIP) gates in quantum circuits require multiple drive lines, which increases the size of the quantum circuit and leads to undesirable effects such as cross-talk between qubits, limiting the scalability and fidelity of quantum gate operations.
Innovation Solution
The method involves frequency multiplexing a plurality of RIP gate signals onto a common control line using filter resonators and capacitors, allowing each RIP gate to be driven by a distinct signal while reducing cross-talk and enhancing relaxation times, thereby condensing the drive line layout and maintaining high fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If multiple drive lines are used to control RIP gates, then each RIP gate can be independently controlled, but the quantum circuit size increases and cross-talk between qubits occurs
Solution Approach 1:
Multiple drive lines are merged into a single shared control line that carries multiplexed signals for controlling multiple RIP gates. The patent combines separate control paths into one unified bus, reducing the number of physical lines while maintaining independent control capability through frequency or time division multiplexing.
Solution Approach 2:
The shared control line serves multiple functions by carrying control signals for multiple different RIP gates simultaneously. This universal control bus can address and control any combination of RIP gates in the system, replacing the need for dedicated control lines for each gate.
2Ease of operation
If multiple drive lines are used to control RIP gates, then each RIP gate can be independently controlled, but cross-talk between qubits increases
Solution Approach 1:
Filter resonators are introduced as intermediary components between the shared control line and individual RIP gates. These resonators selectively filter and route specific frequency components of the multiplexed signal to the intended destination, preventing unwanted signals from reaching adjacent qubits and thus eliminating cross-talk.
Solution Approach 2:
Each RIP gate receives a customized control signal with specific frequency characteristics tailored to its requirements. The filter resonators provide local signal conditioning, ensuring that each qubit pair experiences only the intended control signal without interference from other gates in the system.
3Reliability
If filter resonators are used to filter RIP gate signals, then cross-talk is reduced and relaxation times are enhanced, but the device complexity increases
Solution Approach 1:
The system exploits frequency as a distinguishing parameter to multiplex multiple control signals on a single line. By assigning different frequency characteristics to signals for different RIP gates and using filter resonators tuned to these frequencies, the system achieves signal separation without requiring physically distinct control lines, thus managing complexity through parameter differentiation rather than structural multiplication.
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 allows for efficient control of quantum gate coupling with reduced cross-talk and increased scalability, achieving 99.99% fidelity and enhanced Purcell effect relaxation times by using filter resonators to isolate each RIP gate signal.
Implementation Method 1
filtering a resonator induced phase gate signal from a signal control line that is multiplexed with a plurality of resonator induced phase gate signals
Data Source
AI summary
Techniques regarding quantum gate coupling are provided. For example, one or more embodiments described herein can comprise a method for driving multiple resonator induced phase gates from the same signal control line. The method can comprise controlling quantum gate coupling, via a quantum circuit, by filtering a resonator induced phase gate signal from a signal control line that is multiplexed with a plurality of resonator induced phase gate signals.