Asymmetric Phase Transport for Non-Reciprocal Quantum Wave Transmission
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Solution Overview
Problem
Current non-reciprocal devices for de Broglie waves lack efficient mechanisms to maintain phase coherence in forward transmission while inducing decoherence and absorption in reverse direction, leading to asymmetrical energy transfer and potential violations of thermodynamic laws.
Innovation Solution
A quantum device comprising a four-port circulator with hybrid couplers and a phase shifter connected between them, along with black-body radiators at ports, which maintains phase coherence for forward waves and induces random phases and absorption for backward waves, utilizing thermal excitation for operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If non-reciprocal devices are used for de Broglie waves, then directional transmission is achieved, but phase coherence cannot be maintained in forward direction while inducing decoherence in reverse direction
Solution Approach 1:
The patent applies asymmetry by using a Mach-Zehnder interferometer with asymmetric coupling to a quantum dot. The quantum dot is coupled to only one arm of the interferometer, creating asymmetric interaction that generates directional phase shifts. This asymmetric coupling enables the system to differentiate between forward and backward wave propagation, maintaining phase coherence in the forward direction while inducing decoherence in the reverse direction, thereby resolving the technical contradiction.
2Reliability
If phase shift conversion is implemented using interferometer interference properties, then non-reciprocal transmission is achieved, but device complexity increases
Solution Approach 1:
The patent employs a Mach-Zehnder interferometer that serves multiple functions: it provides phase shifting through asymmetric quantum dot coupling, enables non-reciprocal transmission control, and generates directional interference patterns. This multi-functional design allows a single interferometer structure to accomplish what would otherwise require multiple separate components, thereby reducing overall device complexity while maintaining reliable non-reciprocal transmission.
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 non-reciprocal transmission with conserved energy in forward direction and statistical energy conservation in reverse, potentially generating temperature differences for energy conversion, while operating within a broad temperature range and violating the second law of thermodynamics.
Implementation Method 1
Based on interference of the particles' wave functions, these devices let particles pass preferentially in one direction
Implementation Method 2
Non-reciprocal devices for de Broglie waves can be realized by using Rashba quantum rings
Implementation Method 3
Non-reciprocal devices for de Broglie waves can be realized by using asymmetric Aharonov-Bohm rings
Implementation Method 4
along with black-body radiators at ports, which maintains phase coherence for forward waves and induces random phases and absorption for backward waves, utilizing thermal excitation for operation
Data Source
Figure 1~1B
Figure 2~2C
Figure 3~3B
AI summary
The quantum device (10; 15) comprises a non-reciprocal transmission structure (5, 6, 7; 13, 14), wherein the transmission structure is designed such that for first waves traversing the transmission structure in a forward direction the phases of the first waves are at least partially conserved, and for second waves traversing the transmission structure in a backward direction, the phases of the second waves are at least partially replaced by random ones, such that the phase conservation is more pronounced in the forward direction than in the backward direction.