Dual-Resonator Qubit Control for Quantum Phase Error Reduction
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Solution Overview
Problem
Superconducting qubits in quantum computing systems face phase errors due to noise and timing jitter in control pulses, which affect the stability of quantum logic states.
Innovation Solution
A quantum system with a superconducting qubit coupled to a quantum resonator system featuring two resonators of approximately equal frequencies, where the qubit manipulates photons to encode quantum logic states, and periodic swapping of photons between resonators mitigates phase errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a superconducting qubit with Josephson junction is used to store quantum states, then quantum operations can be performed, but phase errors occur due to current fluctuations and frequency variations
Solution Approach 1:
The quantum resonator system is divided into two separate resonators (first resonator and second resonator) with approximately equal resonator frequencies. By segmenting the storage function across two resonators and using their collective quantum states to represent logical quantum states, the system reduces sensitivity to phase errors in individual resonators, thereby improving quantum operation accuracy while mitigating phase error accumulation.
2Productivity
If control pulses are used to perform gate operations on superconducting qubits, then quantum logic operations can be executed, but timing jitter in control pulses translates into phase jitter
Solution Approach 1:
The system performs periodic swapping of the quantum state between the first and second resonators. This periodic action refreshes the quantum state representation and prevents cumulative phase errors from timing jitter in control pulses, maintaining phase precision while enabling quantum gate operations.
3Power
If the energy of quantum |1> state is greater than quantum |0> state, then quantum operations can proceed, but phase always increases in time causing phase drift
Solution Approach 1:
The periodic swapping operation between the two resonators counteracts the continuous phase accumulation that occurs when the |1> state has higher energy than the |0> state. By periodically exchanging the quantum state between resonators with equal frequencies, the system resets phase drift and maintains phase stability while preserving the necessary energy difference for quantum operations.
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 substantially reduces phase errors by maintaining a constant relative phase between resonators, minimizing the impact of timing jitter and frequency mismatches, thereby enhancing the stability of quantum operations.
Implementation Method 1
the superconducting qubit can include a Josephson junction, the difference in energy between the quantum |0> and |1> states can be a function of a current in the Josephson junction
Implementation Method 2
a first resonator and a second resonator having approximately equal resonator frequencies
Data Source
AI summary
One embodiment of the invention includes a quantum system. The system includes a superconducting qubit that is controlled by a control parameter to manipulate a photon for performing quantum operations. The system also includes a quantum resonator system coupled to the superconducting qubit and which includes a first resonator and a second resonator having approximately equal resonator frequencies. The quantum resonator system can represent a first quantum logic state based on a first physical quantum state of the first and second resonators with respect to storage of the photon and a second quantum logic state based on a second physical quantum state of the first and second resonators with respect to storage of the photon.