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Implementation of a Reference Interferometer for Nanodetection

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Cavity-mediated entanglement generation via Landau-Zener interferometry.

C M Quintana¹, K D Petersson, L W McFaul

¹Department of Physics, Princeton University, Princeton, New Jersey 08544, USA.

Physical Review Letters

|May 18, 2013

Summary

Researchers achieved quantum control and entanglement using a superconducting cavity beam splitter. This method directly tests quantum transition formulas and generates entangled Bell states with 78% fidelity.

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Area of Science:

Quantum physics
Superconducting circuits
Quantum information science

Background:

Superconducting circuits are a leading platform for quantum computing.
Controlling quantum states and generating entanglement are crucial for quantum information processing.
Landau-Zener transitions offer a mechanism for manipulating quantum systems.

Purpose of the Study:

To demonstrate quantum control and entanglement generation using a novel Landau-Zener beam splitter.
To experimentally verify the Landau-Zener transition formula in a coupled qubit system.
To explore the generation of entangled states via cavity-mediated qubit-qubit interactions.

Main Methods:

Coupling two transmon qubits to a superconducting cavity to form a Landau-Zener beam splitter.
Performing single and consecutive sweeps through the qubit-qubit avoided crossing.
Utilizing two-qubit state tomography to characterize the generated quantum states.

Main Results:

Direct experimental test of the Landau-Zener transition formula.
Observation of Landau-Zener-Stückelberg interference patterns with tunable visibility.
Generation of a Bell state with 78% fidelity via a single passage, limited by qubit relaxation.

Conclusions:

The demonstrated Landau-Zener beam splitter is an effective tool for quantum control and entanglement generation.
The experimental results align with theoretical predictions of Landau-Zener transitions.
Further improvements in qubit coherence are needed to enhance the fidelity of generated entangled states.