Optical Resonator Coupling for Silicon Spin Qubit Readout
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Solution Overview
Problem
Existing techniques for implementing quantum computers using nuclear spins of donor atoms in silicon substrates face challenges in realizing reliable state preparation, low decoherence rates, and accurate quantum gate operations, particularly in achieving well-defined qubits and multi-qubit coupling.
Innovation Solution
A quantum information processing device is developed with a semiconductor substrate containing deep impurities characterized by multiple quantum states, optically coupled to an optical resonator, which enables initialization, resonance, and measurement of quantum states using pulsed magnetic fields and optical structures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If nuclear spins of donor atoms in silicon substrates are used to implement quantum computers, then quantum information storage is achieved, but reliable state preparation and accurate quantum gate operations are difficult to realize
Solution Approach 1:
The patent introduces an optical resonator as an intermediary system that couples to the nuclear spin qubits. The resonator mediates quantum gate operations and state preparation by providing a controllable electromagnetic interface, thereby simplifying the direct manipulation complexity while maintaining reliability through the resonant coupling mechanism
Solution Approach 2:
The patent utilizes changes in magnetic field parameters (via pulsed magnetic fields) and optical resonator frequency parameters to control and manipulate the quantum states. By dynamically adjusting these parameters, reliable state preparation and accurate gate operations are achieved without increasing device structural complexity
2Reliability
If deep impurities with multiple quantum states are optically coupled to resonators, then well-defined qubits with low decoherence are achieved, but device structure becomes more complex
Solution Approach 1:
The optical resonator serves multiple functions simultaneously: it acts as a qubit definition mechanism through resonant coupling, provides a readout mechanism for quantum states, and enables gate operations. This multi-functionality reduces the need for separate components, thereby limiting the increase in overall device complexity while achieving well-defined qubits with low decoherence
Solution Approach 2:
The patent positions the deep impurities at specific depths in the semiconductor substrate where they experience uniform coupling to the optical resonator mode. This equipotential positioning ensures consistent qubit definition and low decoherence across multiple qubits without requiring complex individual addressing structures
3Ease of operation
If pulsed magnetic fields are applied to initialize and manipulate donor atom states, then quantum state control is improved, but energy consumption increases
Solution Approach 1:
The patent employs periodic pulsed magnetic fields rather than continuous fields to initialize and manipulate donor atom states. By applying magnetic field pulses only when needed for state preparation or gate operations, energy consumption is reduced while maintaining ease of quantum state control through the periodic excitation and manipulation cycles
Solution Approach 2:
The pulsed magnetic fields induce phase transitions in the quantum states of the donor atoms (e.g., between spin states or between ground and excited states). These controlled phase transitions enable precise quantum state manipulation with minimal energy input, as the energy is delivered in concentrated pulses rather than continuously
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 solution provides a system with well-defined qubits, low decoherence rates, and accurate quantum gate operations, facilitating efficient quantum computing and communication by interconverting stationary and flying qubits.
Implementation Method 1
a first optical resonator having a first photonic mode with a first resonator frequency and an optical state representing resonator information. The first optical resonator optically couples the qubit information and the resonator information.
Implementation Method 2
applying a pulsed magnetic field to the first donor atom to change states
Data Source
AI summary
A quantum information processing device including a semiconductor substrate. An optical resonator is coupled to the substrate. The optical resonator supports a first photonic mode with a first resonator frequency. The quantum information processing device includes a non-gaseous chalcogen donor atom disposed within the semiconductor substrate and optically coupled to the optical resonator. The donor atom has a transition frequency in resonance with the resonator frequency. Also disclosed herein are systems, devices, articles and methods with practical application in quantum information processing including or associated with one or more deep impurities in a silicon substrate optically coupled to an optical structure.