Remote Entanglement of Superconducting Qubits via Double Optical Heralding
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing techniques face challenges in achieving remote entanglement of superconducting quantum bits (qubits) due to the difficulty in heralding entanglement at microwave frequencies, where room-temperature noise is significant, and the inefficiency of converting microwave photons to optical photons.
Innovation Solution
The implementation of a double optical heralding process, which involves two optically heralded entanglement operations to exclude all possible quantum states except for the maximally entangled Bell state, using optical photons to entangle remote superconducting qubits.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If optical heralding is used to entangle remote superconducting qubits, then entanglement can be achieved over long distances, but unwanted quantum states (|00> and |11>) cannot be excluded, preventing maximally entangled Bell state formation
Solution Approach 1:
The patent divides the single heralding process into two separate sequential heralding operations. The first heralding process excludes the |00> state, and the second heralding process excludes the |11> state. This segmentation allows each heralding process to focus on eliminating one specific unwanted state, thereby achieving complete exclusion of both unwanted states and forming the maximally entangled Bell state while maintaining long-distance entanglement capability
Solution Approach 2:
The patent performs the first heralding action before the second heralding action in a sequential manner. By preliminarily excluding the |00> state through the first heralding process, the system prepares the quantum state in a condition where only the second unwanted state |11> remains to be excluded. This preliminary action simplifies the overall entanglement purification process and enables systematic achievement of the Bell state
Data Source
AI summary
Techniques are provided for performing an optically heralded entanglement process to entangle states of a first data quantum bit and a second data quantum bit into an entangled state of computational basis states comprising a ground state and a first excited state. An optically heralded entanglement process comprises performing a first optically heralded entanglement process to determine whether the entangled state of the first data quantum bit and the second data quantum bit excludes a state in which both the first data quantum bit and the second data quantum bit can be in the ground state, and performing a second optically heralded entanglement process to determine whether the entangled state of the first data quantum bit and the second data quantum bit excludes a state in which both the first data quantum bit and the second data quantum bit can be in the first excited state.