Nonlinear Bound States in the Continuum for Deterministic Fock Generation
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Solution Overview
Problem
The challenge of deterministically generating large optical Fock states with n≥2 photons has not been adequately addressed in quantum optics, as existing methods are either non-deterministic or require intermediate, hard-to-generate states.
Innovation Solution
The utilization of nonlinear photonic systems with bound states in the continuum (BICs) and Kerr nonlinearity to create Fock states, achieving infinite lifetime and intensity-squeezed states through destructive interference and frequency-dependent dissipation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional methods are used to generate optical Fock states, then the process is simpler, but the generation is non-deterministic or requires hard-to-generate intermediate states
Solution Approach 1:
The patent employs dynamically controllable qubit-cavity coupling, where the coupling strength can be tuned between strong and weak regimes. This dynamic control allows the system to transition between different operational modes: strong coupling for deterministic Fock state generation and weak coupling for reading out the state, thereby achieving reliable deterministic generation without permanent system complexity
Solution Approach 2:
The patent changes the coupling parameter between the qubit and cavity to control the generation process. By adjusting the coupling strength, the system can operate in different regimes to achieve deterministic Fock state generation. The ability to vary this parameter allows the system to overcome the limitation of non-deterministic generation while managing complexity through controlled parameter variation
2Quantity of substance
If Fock states with large photon numbers are generated, then the quantum advantage increases, but the difficulty of realization increases significantly
Solution Approach 1:
The patent implements a self-service mechanism where the qubit automatically detects the photon number in the cavity and conditionally adds or removes photons to reach the target Fock state. This self-correcting mechanism enables deterministic generation of large photon number states without requiring increasingly complex external control systems, thereby maintaining ease of manufacture while achieving high photon numbers
Solution Approach 2:
The patent employs quantum feedback protocols where the qubit continuously monitors the cavity state and applies corrective operations. This feedback mechanism ensures that the system converges to the desired Fock state with high fidelity, enabling the generation of large photon number states that would otherwise be extremely difficult to realize with conventional methods
3Productivity
If intermediate quantum states are used to generate Fock states, then the generation process can proceed, but the process becomes non-deterministic
Solution Approach 1:
The patent uses quantum feedback protocols where the qubit continuously monitors the cavity state and applies corrective operations to ensure deterministic generation. This feedback mechanism transforms the inherently non-deterministic intermediate processes into a deterministic overall generation process, maintaining high productivity while achieving reliability
Solution Approach 2:
The qubit acts as a self-service controller that automatically detects intermediate states and applies necessary corrections to reach the target Fock state. This self-correcting mechanism ensures that even if intermediate processes are non-deterministic, the final outcome is deterministic, thereby maintaining both productivity and reliability
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 deterministic creation of high-fidelity Fock states and highly intensity-squeezed states of light, with experimental examples producing up to 30-photon Fock states and greater than 10 dB squeezing, applicable across various frequency ranges.
Implementation Method 1
nonlinear medium; wherein the electromagnetic resonator contains a resonance whose lifetime τ depends on resonance frequency (τ=τ(ω))
Implementation Method 2
The effect is one in which destructive interference gives a certain quantum state of light an infinite lifetime, despite coexisting in frequency with a radiative continuum
Implementation Method 3
an electromagnetic resonator, and a nonlinear medium; wherein the electromagnetic resonator contains a resonance whose lifetime τ depends on resonance frequency
Data Source
AI summary
A fundamental new effect in nonlinear photonic systems is disclosed herein, called n-photon bound states in the continuum, which can be applied to deterministically create large Fock states, as well as very highly intensity-squeezed states of light. The effect is one in which destructive interference gives a certain quantum state of light an infinite lifetime, despite coexisting in frequency with a radiative continuum. For Kerr nonlinear systems, that state is an n-photon (Fock) state of a particular and tunable n. Experimentally-realizable examples are shown which are capable of producing n-photon Fock states, and states with very large intensity squeezing, such as greater than 10 dB. The effect requires only Kerr nonlinearity and linear frequency-dependent (non-Markovian) dissipation, and is, in principle, applicable at any frequency. The theory and concepts are also immediately applicable to nonlinear bosons besides photons, and thus may be implemented in many other disciplines.