Two-Qubit State Transmission via Optical Phase-Sensitive Amplifier
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Solution Overview
Problem
The challenge in quantum communications is the loss of qubits during direct transmission over waveguide channels, which limits throughput due to the no cloning theorem, and existing solutions like quantum repeater networks are complex and costly, not suitable for all applications.
Innovation Solution
A method for transmitting a two-qubit state by propagating it onto a transmission waveguide with a specific phase and using a pump pulse to distribute and amplify the state, employing optical phase-sensitive amplifiers (OPSA) to reduce loss and maintain state fidelity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If direct transmission of qubits over waveguide channels is used, then the system is simple and cost-effective, but qubit loss occurs which limits throughput
Solution Approach 1:
The patent uses an optical phase-sensitive amplifier (OPSA) as an intermediary device in the quantum communication channel. The OPSA amplifies the quantum signal while adding minimal noise, effectively reducing qubit loss during transmission without requiring complex quantum repeater networks. This mediator approach resolves the contradiction by maintaining system simplicity while improving throughput through targeted amplification.
Solution Approach 2:
The patent changes the operational parameters of the transmission system by introducing phase-sensitive amplification with specific gain characteristics. By optimizing the amplifier gain and phase matching conditions, the system achieves improved qubit transmission fidelity and reduced loss, thereby increasing throughput while maintaining direct transmission architecture.
2Loss of energy
If quantum repeater networks are implemented, then qubit loss is reduced through entanglement distribution and teleportation, but device complexity and cost increase significantly
Solution Approach 1:
The patent extracts the essential function of quantum repeaters (signal regeneration and loss compensation) and implements it through a simplified OPSA-based approach. By taking out the complex entanglement distribution and teleportation infrastructure and replacing it with direct phase-sensitive amplification, the system achieves comparable loss reduction with significantly reduced device complexity and cost.
Solution Approach 2:
The patent uses the OPSA to create amplified copies of the quantum signal states during transmission. Rather than requiring full quantum repeater nodes with multiple qubits and complex operations, the OPSA generates copied signal states through linear amplification processes that preserve quantum coherence while compensating for 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
This approach enables the transmission of two-qubit states over long distances with reduced loss, improving throughput and maintaining state quality, as demonstrated by increased coincidence counting rates and visibility, exceeding direct transmission capabilities by more than 5 standard deviations.
Implementation Method 1
transmitting the two-qubit state through the transmission waveguide using a pump pulse having the certain phase
Data Source
AI summary
In one aspect, there is provided a method for transmitting a two-qubit state. The method includes: propagating the two-qubit state onto a transmission waveguide, wherein the propagating includes distributing the two-qubit state about a certain phase; and transmitting the two-qubit state through the transmission waveguide using a pump pulse having the certain phase, wherein the pump pulse is provided in a manner so that the transmission waveguide functions as an optical phase sensitive amplifier (OPSA).