Chiral Qubits Using Dirac Semimetals for Room-Temperature Quantum Computing
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Solution Overview
Problem
Conventional quantum computing systems face challenges such as short coherence times, limited operation frequencies, and the need for low temperatures, which restrict their performance and scalability.
Innovation Solution
The use of chiral qubits formed from Dirac or Weyl semimetals, which operate at terahertz frequencies and maintain coherence at higher temperatures, allowing for longer coherence times and higher switching frequencies without the need for cryogenic cooling.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If superconducting qubits are used, then quantum computation can be performed, but the system requires cooling to very low temperatures (about 10 mK) which complicates the system and limits scalability
Solution Approach 1:
The patent changes the material parameter from superconducting materials to chiral materials (Dirac or Weyl semimetals), which fundamentally alters the operating temperature parameter from cryogenic (10 mK) to room temperature, eliminating the need for complex cooling systems while maintaining quantum coherence
Solution Approach 2:
The patent replaces the mechanical cooling system (cryogenic refrigeration) with a material-based solution (chiral materials with topological protection), substituting a complex mechanical temperature control system with intrinsic material properties that provide thermal stability
2Productivity
If superconducting qubits are used, then quantum gates can be implemented, but the operation frequency is limited to the gigahertz (GHz) range due to the superconducting gap
Solution Approach 1:
The patent changes the material parameter from superconducting materials with fixed energy gaps to chiral materials with tunable band structures, enabling the operation frequency parameter to increase from GHz to THz range by exploiting the linear dispersion relation and high Fermi velocity of Dirac/Weyl fermions
Solution Approach 2:
The patent employs composite material structures combining Dirac or Weyl semimetals with other materials to create qubits that operate at THz frequencies, utilizing the unique electronic structure of these topological materials to overcome the frequency limitations of conventional superconducting qubits
3Duration of action of moving object
If conventional quantum computing systems are used, then computation can be performed, but decoherence times are short (fraction of a millisecond) which limits the number of operations
Solution Approach 1:
The patent applies topological protection in advance to shield the quantum state from decoherence, using the inherent robustness of chiral materials to protect against environmental noise and defects before they can cause decoherence, thereby extending coherence time from fractions of a millisecond to potentially much longer durations
Solution Approach 2:
The patent uses chiral materials with specific topological properties that provide enhanced coherence times, combining the advantages of topological protection with quantum computing requirements to achieve longer operational lifetimes for quantum states
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
Chiral qubits achieve coherence times of up to 100 nanoseconds and operate at frequencies of 10 terahertz or higher, enabling efficient quantum error correction and potentially faster quantum computing at room temperature.
Implementation Method 1
Each of at least the subset of qubits is configured to receive a circularly polarized radiation source. The radiation source is adapted to excite a chiral current in each of at least the subset of qubits
Implementation Method 2
at least one terahertz cavity coupled with the qubits, the terahertz cavity being configured to detect the quantum states of the qubits
Data Source
AI summary
An apparatus for performing quantum computing includes multiple qubits, each of at least a subset of the qubits comprising a loop formed of a Dirac or Weyl semimetal and having at least two stable quantum states. The apparatus further includes at least one terahertz cavity coupled with the qubits, the terahertz cavity being configured to detect the quantum states of the qubits. Each of at least the subset of qubits is configured to receive a circularly polarized radiation source. The radiation source is adapted to excite a chiral current in each of at least the subset of qubits, the quantum states of the plurality of qubits being a function of the chiral current.