Flux-Qubit Coupling Control With Time-Modulated Magnetic Flux
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Solution Overview
Problem
Existing quantum computation systems face issues with uncontrollable coupling between qubits, leading to unwanted interactions.
Innovation Solution
A quantum computation system that includes a control device to apply time-modulated magnetic fluxes to coupling flux qubits, allowing for the controlled on/off states of qubit couplings by modulating magnetic fluxes during specific time periods.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If coupling flux qubits are used to couple two qubits, then qubit coupling is enabled, but the coupling cannot be turned off and unwanted interactions occur
Solution Approach 1:
The patent applies dynamics by making the coupling flux qubit's magnetic flux time-modulated. The coupling strength between qubits is dynamically adjusted by changing the magnetic flux through the coupling flux qubit over time, allowing the coupling to be turned on during computation and turned off to prevent unwanted interactions. This dynamic control resolves the contradiction by enabling adaptable coupling while eliminating harmful static coupling.
Solution Approach 2:
The patent implements periodic action by applying periodic magnetic flux modulation to the coupling flux qubit. The magnetic flux is varied periodically in time, creating alternating coupling and decoupling states. This periodic action allows the system to maintain coupling when needed and disconnect when unnecessary, thereby resolving the technical contradiction between enabling coupling and preventing unwanted interactions.
2Ease of operation
If magnetic flux is applied to coupling flux qubit to control coupling, then coupling control is achieved, but quantum tunneling effects increase
Solution Approach 1:
The patent applies parameter changes by modulating the magnetic flux parameter of the coupling flux qubit over time. By changing the magnetic flux parameter dynamically, the system achieves coupling control while managing quantum tunneling effects. The time-modulated magnetic flux creates varying energy potentials that control both coupling strength and tunneling probability, resolving the contradiction between ease of control and harmful tunneling effects.
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
Enables precise control over qubit couplings, reducing quantum tunneling effects and enhancing stability by maintaining distinct energy potentials, thus facilitating efficient quantum computation.
Implementation Method 1
a first magnetic flux application unit configured to apply a magnetic flux to the coupling flux qubit, and the control device causes the first magnetic flux application unit to apply a first magnetic flux having a first time modulation during a first time period, and apply a second magnetic flux having a second time modulation different from the first time modulation during a second time period different from the first time period
Data Source
AI summary
A quantum computation system has a quantum device, and a control device that controls the quantum device. The quantum device has a first qubit, a second qubit, a flux qubit for coupling that can couple with the first qubit and the second qubit, and a first magnetic flux application unit that applies a magnetic flux to the flux qubit for coupling. The control device causes the first magnetic flux application unit to apply a first magnetic flux, which is provided with a first time modulation, during a first time period, and apply a second magnetic flux, which is provided with a second time modulation differing from the first time modulation, during a second time period differing from the first time period.