Cascaded Delay-Line Quantum Memory With Tunable Photonic Qubit Storage
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Solution Overview
Problem
Existing photonic quantum memories, particularly matter-based systems, face limitations such as narrow bandwidth, high operational costs due to cryogenic requirements, and low retrieval efficiency into single-mode fibers, while fiber-based delay-line memories offer limited tunability and optical loss in specific wavelength bands.
Innovation Solution
A delay-line quantum memory device comprising cascaded optical stages with varying optical delay times, utilizing free-space cavities and recirculation switches, including Pockels cells and beam splitters, to store and manage photonic qubits efficiently, with active temperature stabilizers to maintain alignment and path length stability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If matter-based quantum memory systems are used, then quantum information storage is achieved, but bandwidth is limited and cryogenic infrastructure is required
Solution Approach 1:
The patent replaces matter-based quantum memory systems with a photonic delay line system. Instead of storing quantum information in matter (atoms, ions, or solid-state systems), the invention uses optical delays in free-space or fiber-based pathways to store photonic qubits. This substitution eliminates the need for cryogenic infrastructure and bandwidth limitations inherent in matter-based systems, while maintaining quantum information storage capability through temporal encoding.
2Reliability
If matter-based quantum memory systems are used, then quantum information storage is achieved, but costly cryogenic infrastructure is required
Solution Approach 1:
The patent replaces matter-based quantum memory systems with a photonic delay line system. Instead of storing quantum information in matter (atoms, ions, or solid-state systems), the invention uses optical delays in free-space or fiber-based pathways to store photonic qubits. This substitution eliminates the need for cryogenic infrastructure and bandwidth limitations inherent in matter-based systems, while maintaining quantum information storage capability through temporal encoding.
3Duration of action of moving object
If fiber-based delay-line memories are used, then optical path storage is achieved, but optical loss occurs in specific wavelength bands
Solution Approach 1:
The patent introduces free-space optical pathways as an intermediary medium between input/output fibers and the delay storage mechanism. By converting fiber-based optical signals to free-space propagation, the system avoids wavelength-dependent optical losses inherent in fiber materials. The free-space portion acts as a mediator that preserves optical energy across broader wavelength bands while maintaining the delay-line storage function.
4Duration of action of moving object
If fiber-based delay-line memories are used, then optical path storage is achieved, but tunability is limited
Solution Approach 1:
The patent implements dynamic tunability in the delay line system through adjustable optical path lengths. By incorporating movable mirrors, variable optical delays, or reconfigurable photonic circuits, the system can dynamically adjust storage duration and path characteristics. This dynamic capability enables the delay line to adapt to different quantum protocols and storage requirements, overcoming the fixed-tunability limitation of conventional fiber-based systems.
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 device achieves high-fidelity storage and retrieval of photonic qubits with tunable delay times, avoiding costly infrastructure and fiber losses, supporting multiple photonic degrees of freedom and enabling efficient multiplexing of qubits.
Implementation Method 1
utilizing free-space cavities and recirculation switches, including Pockels cells and beam splitters
Implementation Method 2
utilizing free-space cavities and recirculation switches, including Pockels cells and beam splitters
Implementation Method 3
active temperature stabilizers to maintain alignment and path length stability
Data Source
AI summary
Example embodiments relate to delay-line quantum memories. One example embodiment includes a device. The device includes a plurality of cascaded optical stages coupled with one another. Each optical stage includes an optical delay line. The optical delay line is configured to receive light at an input. The optical delay line is also configured to propagate light from the input to an output. Light propagates from the input to the output with an associated optical delay time. The optical delay times associated with different optical stages are different from one another. Each optical stage also includes a stage-level recirculation switch configured to receive light at the output of the optical delay line and selectively recirculate the light through the input of the optical delay line. The device also includes a device-level recirculation switch configured to receive light exiting the last optical stage and selectively recirculate the light through the first optical stage.