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Entangling logical qubits with lattice surgery
Alexander Erhard1, Hendrik Poulsen Nautrup2, Michael Meth1
1Institute for Experimental Physics, University of Innsbruck, Innsbruck, Austria.
Nature
|January 14, 2021
Summary
Researchers demonstrated lattice surgery, a key technique for quantum error correction, between two logical qubits. This advance in fault-tolerant quantum computing enables essential operations like entanglement and teleportation.
Area of Science:
- Quantum Information Science
- Quantum Computing Architectures
- Fault-Tolerant Quantum Computation
Background:
- Quantum computing development relies on fault tolerance via quantum error correction.
- Fault-tolerant logical operations require significant overhead on logical qubits.
- Lattice surgery offers a resource-efficient method for implementing logical operations.
Purpose of the Study:
- To experimentally realize lattice surgery between topologically protected logical qubits.
- To demonstrate fundamental operations for fault-tolerant quantum computation.
Main Methods:
- Utilized a ten-qubit ion-trap quantum information processor.
- Implemented lattice surgery by merging and splitting physical qubits.
- Performed quantum non-demolition measurements using local, entangling gates, and auxiliary qubit measurements.
Main Results:
- Successfully demonstrated lattice surgery between two logical qubits.
- Achieved entanglement between the two logical qubits.
- Implemented logical state teleportation between the logical qubits.
Conclusions:
- The experimental realization of lattice surgery is a significant step towards efficient fault-tolerant quantum computation.
- Demonstrated fundamental building blocks for quantum computation using lattice surgery.
- This work paves the way for scalable quantum information processing.
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