Photonic Quantum Computing System Using Temporal Encoding
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Solution Overview
Problem
Current measurement-based quantum computation schemes face challenges in scalability and experimental feasibility due to the need for noiseless entangling and swap gates, which are difficult to realize, especially for topological error correction in 3D cluster states.
Innovation Solution
A measurement-based photonic quantum computing system with a delocalized measurement architecture that uses relative time delays and variable path-couplers to generate coexisting optical inputs, enabling interferometric operations and scalable fault-tolerant quantum computation by implementing two-mode or single-mode gates and readout with homodyne detectors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If 3D cluster state generation with topological error correction is implemented, then fault tolerance is improved, but experimental feasibility deteriorates due to the need for noiseless on-line entangling and swap gates
Solution Approach 1:
The patent transitions from spatial encoding to temporal encoding, adding a time dimension to the cluster state structure. This allows the 3D cluster state to be constructed in the time domain rather than requiring complex spatial arrangements, thereby achieving topological error correction without needing experimentally difficult noiseless on-line entangling and swap gates.
Solution Approach 2:
The patent replaces the mechanical/optical manipulation required for noiseless on-line entangling and swap gates with a measurement-based approach using homodyne detection. This substitution eliminates the need for precise real-time gate operations while maintaining the fault tolerance provided by topological error correction.
2Reliability
If spatial encoding is used for 3D cluster state generation, then topological error correction is enabled, but scalability is limited due to resource requirements
Solution Approach 1:
The patent encodes the third dimension of the 3D cluster state in the time domain rather than space, using temporal modes and delayed interferometric operations. This temporal encoding approach significantly reduces the spatial resources required while maintaining the topological structure necessary for error correction, thereby improving scalability.
3Productivity
If deterministic preparation of multi-mode entangled cluster state is achieved, then scalability is improved, but noise accumulation worsens due to finite squeezing
Solution Approach 1:
The patent introduces GKP qubits as an intermediary layer between the CV cluster state and the computational logic. The GKP encoding transforms the continuous variable noise from finite squeezing into discrete qubit errors, which can then be corrected by the topological error correction code, thereby managing noise accumulation while maintaining scalability.
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 system allows for experimentally simple and scalable topological error correction, achieving a 10.5 dB threshold with reduced spatial resources, overcoming the limitations of previous schemes by using temporal encoding and integrated photonic circuits.
Implementation Method 1
inducing a first predefined relative time delay into each optical paired inputs for making one mode of the first and one mode of the second optical paired inputs into coexisting optical inputs
Implementation Method 2
delocaled measurement architecture configured for optically interfering coexisting optical inputs for generating intermediate outputs
Implementation Method 3
optically interfering by first and second variable path-couplers for each intermediate output a first mode of the intermediate outputs to a second mode of first or second neighboring intermediate outputs
Implementation Method 4
detecting by two optical detectors, preferably homodyne optical detectors, each mode of the intermediate outputs and the interfered outputs
Data Source
AI summary
A measurement based photonic quantum computing system includes an optical input generator configured for receiving first optical paired inputs, and second optical paired inputs, inducing a first predefined relative time delay into each optical paired inputs for making one mode of the first and one mode of the second optical paired inputs into coexisting optical inputs, representing a logic level of the quantum computing system, a delocalized measurement architecture configured for optically interfering coexisting optical inputs for generating intermediate outputs, optically interfering by first and second variable path-couplers for each intermediate output a first mode of the intermediate outputs to a second mode of first or second neighboring intermediate outputs, respectively, for generating interfered outputs, and detecting by two optical detectors, preferably homodyne optical detectors, each mode of the intermediate outputs and interfered outputs, such that the delocalized measurement architecture is configured for gate implementation of the quantum computing system.