Entangled Photonic State Generation via Integrated Mode Coupling
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Solution Overview
Problem
The reliable generation and maintenance of entangled states in quantum computing are hindered by decoherence and the probabilistic nature of single-photon manipulation, limiting the efficiency of quantum computing processes.
Innovation Solution
The use of integrated optics to generate entangled photonic states by coupling photons in distinct modes, allowing for a higher probability of success and reduced decoherence, with a device that includes photon detectors and couplers to output photons in a Bell state with a non-zero probability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If single-photon manipulation is used to generate entangled states, then the reliability of maintaining entangled states is improved due to low de-coherence rates, but the productivity of generating entangled states deteriorates because the process is probabilistic rather than deterministic
Solution Approach 1:
The patent uses an intermediary system of multiple photonic modes and couplers to mediate the interaction between single photons. By introducing auxiliary photonic modes and using couplers as intermediary elements, the system enables probabilistic single-photon interactions to result in deterministic generation of entangled states at the output, thus resolving the contradiction between reliability and productivity.
2Extent of automation
If conventional methods are used to generate entangled photonic states, then the process can be deterministic, but the quantity of photons required increases and efficiency decreases
Solution Approach 1:
The patent segments the photonic system into multiple distinct photonic modes (first set, second set, third set) with specific functions. By dividing the system into segmented modes that interact through couplers, the patent achieves deterministic entangled state generation using fewer photons compared to conventional methods that require larger photon ensembles.
Data Source
AI summary
A device includes photon detectors, first photonic modes (coupled with photons sources) for outputting a first set of four photons, second photonic modes to provide a second set of at least four photons to the photon detectors, third photonic modes (coupled with the photon sources) to provide a third set of at least photons to the photon detectors, first couplers coupling modes in the first set of photonic modes to modes in the second set of photonic modes, and second couplers coupling modes of the third set of photonic modes to modes of the second set of photonic modes. The first and second couplers are configured to cause the first photonic modes to output, with a first non-zero probability, a pair of photons in a Bell state when a first number of photons is provided to respective inputs of the first photonic modes and the third photonic modes.