Modular Quantum Interconnect With Dual-Arm Memory for Telecom Links
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Solution Overview
Problem
Current quantum interconnect (QuIC) technologies lack a scalable, modular, and telecom-compatible platform that integrates all necessary functionalities such as communication interface, quantum buffer, entanglement source, quantum converter, and quantum transducer.
Innovation Solution
A QuIC module that combines a communication interface at telecommunications wavelengths with a broadband quantum buffer, enabling low-loss optical links and storage/synchronization of quantum information. This system also serves as a quantum repeater for heralded generation, storage, and distribution of photonic entanglement, and facilitates memory-assisted optically-heralded distribution of microwave-microwave entanglement and quantum state transfer.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a quantum interconnect combines all functionalities (communication interface, quantum buffer, entanglement source, quantum converter, and quantum transducer) in a single modular platform, then the device complexity is reduced and scalability is improved, but currently no single platform fulfills all these functionalities simultaneously
Solution Approach 1:
The patent merges multiple quantum functionalities (quantum memory, transducer, converter, and communication interface) into a single rare-earth doped crystal platform. The crystal simultaneously provides quantum state storage, microwave-to-optical transduction, frequency conversion, and entanglement generation, eliminating the need for separate modular components and reducing overall system complexity.
Solution Approach 2:
The rare-earth doped crystal serves multiple functions: it acts as a quantum memory for storing optical and microwave states, a transducer for converting between optical and microwave frequencies, a frequency converter for wavelength transformation, and an entanglement source. This multi-functionality within a single platform directly addresses the versatility requirement while maintaining modularity.
2Adaptability or versatility
If cascaded emission and re-absorption schemes are used for quantum transduction in rare-earth doped crystals, then transduction between different qubit technologies is enabled, but the efficiency is reduced due to necessary detuning from resonance
Solution Approach 1:
The patent uses an intermediary quantum memory state within the rare-earth crystal to facilitate efficient transduction. Instead of direct cascaded emission and re-absorption, the system stores the quantum state in a long-lived memory level, then retrieves it for transduction. This intermediary storage mechanism avoids resonance detuning losses while enabling interface between different qubit technologies.
3Loss of energy
If telecom wavelength optical channels are used for communication between quantum modules, then transmission loss is reduced and compatibility with classical telecommunications infrastructure is improved, but additional quantum frequency conversion or qubit encoding capabilities are required
Solution Approach 1:
The rare-earth doped crystal platform provides both quantum memory functionality and optical-to-microwave transduction capability within the same device. This eliminates the need for separate frequency conversion components, as the crystal can directly interface telecom wavelength optical signals with microwave qubit systems, reducing overall device complexity while maintaining low transmission loss.
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 proposed QuIC enables all desired functionalities in a single architecture, reducing technical complexity and loss, and is inherently compatible with various quantum systems operating in the telecom C-band and microwave regime, offering noise-free, thermally initialized, and GHz bandwidth operations.
Implementation Method 1
A quantum interconnect (QuIC) technology consists of scalable modular devices which act as a common communications bus for other quantum systems to form larger quantum networks of varying size. The QuIC proposed here combines a communication interface at telecommunications wavelengths with a broadband quantum buffer, offering a low-loss optical link and storage/synchronization of quantum information at telecom wavelengths.
Implementation Method 2
A quantum memory that has a dual arm interferometer embedded therein. The dual arm interferometer has a first arm within a crystal and a second arm within the crystal. The interferometer is coupled to a photon source. A microwave resonator has a waveguide coupled to a microwave source. The microwave resonator is coupled to the first arm of the quantum memory. The interferometer generates an output based on the microwave source.
Data Source
AI summary
A quantum interconnect module includes a quantum memory that has a dual arm interferometer embedded therein. The dual arm interferometer has a first arm within a crystal and a second arm within the crystal. The interferometer is coupled to a photon source. A microwave resonator has a waveguide coupled to a microwave source. The microwave resonator is coupled to the first arm of the quantum memory. The interferometer generates an output based on the microwave source.