Entangled Quantum State Receiver Fidelity Control
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Solution Overview
Problem
Current methods for controlling and managing distributed systems that share entanglement are not well developed, limiting the scope of applications that rely on entangled quantum resources.
Innovation Solution
A system and method for sharing entangled quantum states using a shared state comb approach, which involves generating and processing entangled quantum states in multiple bases to establish coincidence and improve fidelity, and using classical networks to facilitate the sharing of entangled information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If distributed systems share entangled quantum resources using current methods, then quantum communication and processing applications can be enabled, but the systems lack effective control and management capabilities
Solution Approach 1:
The patent introduces a classical communication channel as an intermediary to enable coordination between distributed quantum systems. This classical channel facilitates the sharing of measurement results and synchronization information, providing effective control and management capabilities without requiring complex quantum communication infrastructure for these functions.
Solution Approach 2:
The system employs a universal approach where the same entangled quantum resource can be shared across multiple distributed systems for various applications including quantum key distribution, quantum teleportation, and quantum computing. The measurement comb sharing mechanism serves multiple functions: establishing coincidence, improving fidelity, and enabling different quantum protocols simultaneously.
2Loss of information
If entangled quantum states are shared across distributed systems, then quantum information can be transmitted, but the fidelity of entangled state information deteriorates due to noise and loss
Solution Approach 1:
The patent implements feedback mechanisms where measurement results from distributed quantum systems are communicated classically and used to adjust and optimize the entanglement distribution process. This feedback loop enables real-time correction of fidelity degradation caused by noise and loss, improving the reliability of entangled state information transmission.
Solution Approach 2:
The system performs preliminary actions by establishing measurement combs and synchronization protocols before actual quantum information transmission. This preliminary setup includes characterizing the quantum channel, optimizing entanglement generation parameters, and pre-aligning measurement bases, which ensures higher fidelity during subsequent quantum communication operations.
Data Source
AI summary
An entangled quantum state receiver includes an optical detector that generates an electrical signal having a signal characteristic in response to detection of a single photon. A first electrical circuit generating an electrical signal having a predetermined duration when the signal characteristic is present at the input. A clock generates a clock waveform with a period. A second electrical circuit generates a state value when the electrical signal has the predetermined duration during a cycle of the clock waveform. A processor is configured to determine received entangled state information from the state value and configured to adjust the clock period based on a background photon count at the optical detector.