Phononic Crystal Resonator Qubits for Scalable Quantum Storage
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Solution Overview
Problem
Superconducting circuits face challenges in scaling due to the complexity of individually controlling qubits, with on-chip resonators having short coherence times and 3D cavities being difficult to scale, necessitating a compact and long-lived quantum storage solution.
Innovation Solution
A coupled storage qubit nanomechanical resonator in a processing qubit superconducting circuit using a phononic crystal resonator film with a defect mode, where the storage qubit is encoded, and a processing qubit is capacitively coupled to the phononic crystal resonator, enabling efficient quantum information storage and processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If on-chip resonators are used for quantum storage, then compactness is achieved, but coherence time is short
Solution Approach 1:
The patent combines piezoelectric material (for mechanical resonance) with superconducting material (for qubit functionality) to create a hybrid resonator structure. This composite approach enables the device to achieve both compact on-chip integration and extended coherence times by leveraging the high mechanical quality factor of piezoelectric resonators while maintaining quantum coherence through superconducting coupling.
2Duration of action of stationary object
If 3D cavities are used for quantum storage, then coherence time is improved, but scalability is difficult
Solution Approach 1:
The patent replaces traditional electromagnetic 3D cavity storage with a nanomechanical resonator system that uses mechanical phonon modes for quantum state storage. This substitution enables compact on-chip integration while achieving high coherence times through the mechanical resonance of the nanomechanical structure, avoiding the scalability issues of bulky 3D cavities.
3Ease of operation
If individual qubit control is implemented, then processing capability is achieved, but device complexity increases
Solution Approach 1:
The patent employs a single superconducting qubit that serves multiple functions: it acts as both a processing unit for quantum operations and a readout mechanism for the nanomechanical resonator states. This multi-functional approach reduces control complexity by eliminating the need for separate control lines for each storage element, while still enabling full quantum processing capability through the versatile qubit-resonator coupling.
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 architecture achieves robust high-Q mechanical resonances, isolates qubits from phonon leakage, and allows for a substantial number of compact resonators to be fabricated, enhancing quantum computational capacity and coherence times, thereby improving the scalability and performance of quantum circuits.
Implementation Method 1
the phononic crystal resonator film includes a defect mode in a bandgap of the phononic crystal resonator film where a storage qubit is encoded, a pair of electrodes disposed to generate voltages within the phononic crystal resonator film
Implementation Method 2
a processing qubit, where the processing qubit is capacitively coupled to the phononic crystal resonator film by the coupling capacitor
Data Source
AI summary
A coupled storage qubit nanomechanical resonator in a processing qubit superconducting circuit is provided that includes a phononic crystal resonator (PCR) film disposed on a substrate, where the PCR film includes a defect mode in a bandgap of the PCR film where a storage qubit is encoded, a pair of electrodes generate voltages within the PCR film, where the defect is dimensioned to support a unique electrical potential generated by a local mechanical phonon mode of the PCR film, where a unique resonance frequency that is dependent on the defect dimensions is output from the PCR film, a coupling capacitor that is coupled to the PCR film, where the coupling capacitor is disposed to receive the output unique resonance frequency, and a processing qubit, where the processing qubit is capacitively coupled to the PCR film by the coupling capacitor, where the storage qubits are connected to the processing qubits.