Left-Handed Ring Resonators for Tunable Qubit Coupling
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Solution Overview
Problem
Conventional two-qubit gates face limitations in coupling strength, tunability, and coherence time, restricting the number of applicable gates in multi-qubit systems, and often require large physical footprints.
Innovation Solution
A quantum device utilizing a superconducting ring resonator with left-handed wave dispersion for tunable ZZ interactions between qubits, enabling fast and high-fidelity entangling gates through a dense spectrum of non-harmonically separated modes, allowing for multiple pairs of qubits to be entangled sequentially.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If conventional two-qubit gates are used, then coupling strength is limited, but device footprint remains large
Solution Approach 1:
The patent changes the fundamental parameter of wave dispersion from conventional right-handed to left-handed, creating a resonator with non-harmonically separated modes. This parameter change enables dramatically enhanced coupling strength between qubits while maintaining a compact ring geometry, resolving the contradiction between coupling strength and device footprint
Solution Approach 2:
The patent employs a composite resonator structure combining superconducting materials with left-handed metamaterial properties. This composite approach creates a resonator with unique dispersion characteristics that enable strong qubit coupling in a compact form factor, addressing both the coupling strength and footprint requirements
2Adaptability or versatility
If conventional resonators are used, then tunability of interactions is limited, but coherence time is reduced
Solution Approach 1:
The patent introduces dynamic tunability through flux-controlled Josephson junctions in the left-handed resonator. This enables real-time adjustment of coupling strengths and interaction types (ZZ, XY, entangling gates) while the superconducting architecture maintains long coherence times, resolving the contradiction between tunability and coherence preservation
3Adaptability or versatility
If conventional resonators with harmonically separated modes are used, then interaction strength range is limited, but device complexity increases for multi-qubit systems
Solution Approach 1:
The patent fundamentally changes the mode structure parameter from harmonic to non-harmonic spacing through left-handed wave dispersion. This creates a dense spectrum of modes that can be selectively addressed, enabling a wide range of interaction strengths and multi-qubit operations within a single compact resonator, thereby reducing overall device complexity
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
The solution provides a compact footprint with a wide range of interaction strengths, enabling fast and high-fidelity entangling gates, suitable for large-scale quantum processors and applications in quantum computing, simulation, metrology, and quantum sensing.
Implementation Method 1
ring resonator with left-handed wave dispersion
Implementation Method 2
superconducting ring resonator
Implementation Method 3
ring resonator is coupled to the first and second qubits
Data Source
AI summary
A quantum device, i.e., a two-qubit entangling gate, and a related method, are presented. The quantum device includes a first qubit, a second qubit, and a ring resonator with left-handed wave dispersion. The ring resonator is coupled to the first and second qubits. In one embodiment, a quantum device includes a plurality of qubits and a ring resonator with left-handed wave dispersion. The plurality of qubits may include 2, 3, 4, 5 or more qubits positioned around the ring resonator. The ring resonator is coupled to a first pair of the qubits, e.g., a first and second qubit. In such a case, the ring resonator has a dense multi-mode spectrum near the qubit frequencies, allowing for large variations in the interaction strength between the qubits. Such a configuration enables a two-qubit entangling gate that entangles the coupled pair of qubits.