Joint Quantum Receiver Mixing Signal and Idler Modes in Noise

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Solution Overview

Problem

The design of an optimum quantum receiver for achieving entanglement-assisted (EA) channel capacity remains an open problem, and existing schemes like the feedforward sum-frequency generation (FF-SFG) receiver are not suitable for noisy environments, limiting the performance of classical optical communications.

Innovation Solution

The development of low-complexity, high-performance joint quantum receivers using balanced beam splitters, optical hybrids, and balanced detectors that directly mix signal and idler modes to enhance entanglement-assisted communication, employing Gaussian modulation and optical parametric amplifiers or phase-conjugate receivers to improve channel capacity.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If the feedforward sum-frequency generation (FF-SFG) receiver is used, then the receiver can detect the target in highly noisy environment, but it is not suitable for achieving EA channel capacity and requires transmitting the same binary information over 10^6 bosonic modes occupying the whole C and L bands as well as the portion of S band

Engineering Contradiction:

Improvedetection capability in noisy environmentVSAvoidnumber of bosonic modes required

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The patent combines the signal mode and idler mode at a beam splitter to perform joint detection, merging two separate detection paths into a unified measurement process that achieves EA channel capacity with a single receiver design rather than requiring multiple sections across different frequency bands

Inventive Principle:

Principle #5Merging (Combining)

Solution Approach 2:

The patent introduces an idler mode as an intermediary quantum resource that is entangled with the signal mode, allowing the receiver to exploit quantum correlations to achieve superior performance in noisy environments without requiring the transmission of multiple binary copies across different bands

Inventive Principle:

Principle #24Intermediary (Mediator)

2Measurement precision

If multiple sections of FF-SFG receiver are used, then the receiver can achieve quantum binary discrimination, but it does not achieve EA channel capacity

Engineering Contradiction:

Improvequantum binary discrimination capabilityVSAvoidEA channel capacity achievement

Core Design Contradiction:

Measurement precisionVSProductivity

Solution Approach 1:

Instead of using multiple FF-SFG sections to achieve binary discrimination and hoping for EA capacity, the patent inverts the approach by using joint detection of entangled modes directly at the receiver, achieving EA channel capacity as the primary outcome while naturally providing superior binary discrimination capability as a byproduct

Inventive Principle:

Principle #13The other way round (Inversion)

3Device complexity

If classical receivers are used in noisy environments, then the system has lower complexity, but the channel capacity and bit error probability performance are inferior

Engineering Contradiction:

Improvereceiver complexityVSAvoidchannel capacity and bit error probability

Core Design Contradiction:

Device complexityVSReliability

Solution Approach 1:

The quantum receiver uses the entangled idler mode to actively compensate for noise effects in the signal mode through joint detection, allowing the system to overcome noisy environmental conditions and achieve superior channel capacity and bit error probability performance compared to classical receivers

Inventive Principle:

Principle #25Self-service

Solution Approach 2:

The patent employs a composite detection scheme that combines quantum entanglement resources with conventional detection methods, creating a hybrid receiver that achieves quantum-enhanced performance while maintaining practical implementability

Inventive Principle:

Principle #40Composite materials

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

These receivers significantly outperform classical counterparts in noisy environments by achieving higher channel capacities, reducing bit error probabilities, and demonstrating improved performance with lower complexity compared to existing EA schemes.

Implementation Method 1

a signal mode âs and an idler mode âi are directly mixed on a balanced beam splitter to form a mixed beam

Methodology Applied

Scientific EffectQuantum interference: Interference

Implementation Method 2

employing Gaussian modulation and optical parametric amplifiers or phase-conjugate receivers to improve channel capacity

Methodology Applied

Scientific EffectOptical parametric amplification:

Implementation Method 3

employing Gaussian modulation and optical parametric amplifiers or phase-conjugate receivers to improve channel capacity

Methodology Applied

Scientific EffectOptical phase conjugation:

Data Source

PatentUS20250392395A1Quantum receivers for entanglement assisted classical optical communications

Publication Date: 2025.12.25 THE ARIZONA BOARD OF REGENTS ON BEHALF OF THE UNIV OF ARIZONA

AI summary

A joint quantum receiver for entanglement assisted communication, assuming that the optical-phase conjugation is performed on transmitter side. The joint quantum receiver may base on a balanced beam splitter or an optical hybrid. A signal mode âs and an idler mode âi are directly mixed on the BBS or the optical hybrid to form a mixed beam, and the BBS or optical hybrid splits the mixed beam into a first beam and a second beam and outputs the first and second beams to the balanced detector. The balanced detector detects either in-phase or quadrature components. For heterodyne detection, the 2-D entanglement assisted detection scheme is provided.