Defect-Embedded Semiconductor Structure for Tunable Narrow-Line Single Photons
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Solution Overview
Problem
Solid-state defects in quantum information processing devices suffer from charge instability and spectral diffusion, leading to reduced entanglement rates, spectral indistinguishability, and quantum coherence, which are critical for practical applications.
Innovation Solution
Implementing a p-i-n diode structure with electric and optical controls to deplete free carriers, stabilize charge environments, and induce Stark shifts, using optical repumping to maintain narrow emission lines and spectral tunability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If external electric or optical control is applied to tune quantum information processing functions, then controllable/tunable properties are improved, but charge instability and spectral diffusion occur which deteriorate quantum coherence and spectral indistinguishability
Solution Approach 1:
The patent introduces a p-i-n diode structure as an intermediary system between the control mechanism and the solid-state defect. The diode's intrinsic layer acts as a mediator that generates controlled electric fields to tune the defect's quantum properties while its doped regions serve as charge reservoirs to stabilize the defect's charge state, thereby maintaining quantum coherence during external control
Solution Approach 2:
The patent applies electric bias to the p-i-n diode structure to dynamically change the electric field parameter experienced by the solid-state defect. This enables continuous tuning of the defect's emission wavelength and quantum information processing functions while the diode's structure maintains stable charge environment through its specific doping configuration
2Adaptability or versatility
If electric bias is applied to tune emission wavelength and timing, then spectral tunability is improved, but free carriers cause spectral diffusion which broadens emission linewidth
Solution Approach 1:
The patent creates a localized controlled environment around the solid-state defect by positioning it within the intrinsic layer of the p-i-n diode. This local configuration ensures that the defect experiences a controlled electric field for wavelength tuning while being surrounded by a charge-stable environment provided by the depleted intrinsic region, preventing spectral diffusion
Solution Approach 2:
The patent implements dynamic control of the electric field applied to the defect through variable electric bias on the p-i-n diode, enabling real-time tuning of emission wavelength. Simultaneously, the diode's structure dynamically maintains charge stability through its depletion region, allowing spectral tuning without linewidth broadening
3Power
If optical excitation is used to prepare defect into excited state, then optical emission is generated, but charge state fluctuation occurs leading to spectral diffusion
Solution Approach 1:
The p-i-n diode structure serves as an intermediary that mediates between the optical excitation process and the defect's charge state. The intrinsic layer's depletion region acts as a protective barrier that stabilizes the charge environment during optical excitation, preventing charge state fluctuations while allowing optical emission to proceed
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
Achieves stable, narrow, and tunable single photon emission for quantum information processing, maintaining high quantum coherence and spectral indistinguishability without degrading spin properties.
Implementation Method 1
generating the optical emission from radiative relaxation of the optically bright excited state of the defect
Implementation Method 2
the electric bias is configured to control a timing, an emission spectral linewidth, or a wavelength of the optical emission from the defect
Data Source
AI summary
This disclosure relates to optical devices for quantum information processing applications. In one example implementation, a semiconductor structure is provided. The semiconductor structure may be embedded with single defects that can be individually addressed. An electric bias and/or one or more optical excitations may be configured to control the single defects in the semiconductor structure to produce single photons for use in quantum information processing. The electric bias and optical excitations are selected and adjusted to control various carrier processes and to reduce environmental charge instability of the single defects to achieve optical emission with wide wavelength tunability and narrow spectral linewidth. Electrically controlled single photon source and other electro-optical devices may be achieved.