Logical Bell State Generation Using Boundary Ancilla Qubits
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional methods for generating a logical Bell state of two logical qubits are inefficient, leading to increased processing time and risk of error propagation due to the need for entangling ancilla qubits for merging and subsequent splitting, which can destroy the logical state of each logical qubit.
Innovation Solution
The method involves arranging data qubits in a quantum computer to entangle ancilla qubits closer to the side of each logical qubit than the data qubits, minimizing pairs of entangled ancilla qubits and avoiding the need for splitting, thus reducing processing time and error occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If ancilla qubits for merging are arranged on each logical qubit and entangled to generate logical Bell state, then the logical Bell state can be generated, but the processing time increases and error propagation risk increases due to subsequent merging and splitting operations
Solution Approach 1:
The patent extracts the ancilla qubits for merging from the logical qubit structure, arranging them outside the logical qubits. This allows entangling operations to be performed on ancilla qubits without requiring subsequent merging and splitting operations on the logical qubits themselves, thereby reducing processing time and error propagation risk while maintaining the ability to generate logical Bell states
Solution Approach 2:
The patent uses ancilla qubits as intermediary elements to mediate the entangling operation between logical qubits. By performing entangling operations on the ancilla qubits (which are arranged outside the logical qubits) rather than directly on the logical qubits, the system avoids the need for destructive merging and splitting operations, thus reducing both processing time and error rate
2Productivity
If ancilla qubits are arranged closer to the other logical qubit than data qubits, then entangling operations can be performed without data qubits, but the qubit arrangement complexity increases
Solution Approach 1:
The patent segments the quantum system into distinct functional zones: logical qubits for data storage, ancilla qubits for entangling operations arranged outside the logical qubits, and measurement qubits for readout. This spatial segmentation allows entangling operations to be performed efficiently on ancilla qubits without disrupting data qubits, improving productivity while managing complexity through clear functional separation
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 reduces processing time and error rate by generating logical Bell states more efficiently and allowing for immediate error correction, preventing state destruction and reducing the need for splitting.
Implementation Method 1
generating a logical Bell state of two logical qubits that are to be coupled to each other... the logical Bell state being generated by entangling between the two logical qubits
Data Source
AI summary
A recording medium stores therein an information processing program for causing a computer to execute a process including: generating a logical Bell state of two logical qubits that are to be coupled to each other, each of the two logical qubits having an arrangement of a plurality of qubits including a plurality of data qubits and a plurality of ancilla qubits, the logical Bell state being generated by entangling between the two logical qubits, all ancilla qubits that of the plurality of ancilla qubits of the each of the two logical qubits, are arranged closer to the other of the two logical qubits to be coupled thereto than is the plurality of data qubits thereof, the entangling being free of the plurality of data qubits.