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Generation and Coherent Control of Pulsed Quantum Frequency Combs

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Superfluid qubit systems with ring shaped optical lattices.

Luigi Amico¹, Davit Aghamalyan², Filip Auksztol³

¹CNR-MATIS-IMM & Dipartimento di Fisica e Astronomia, Via S. Sofia 64, 95127 Catania, Italy Centre for Quantum Technologies, National University of Singapore, 3 Science Drive 2, Singapore 117543 and Institute of Advanced Studies, Nanyang Technological University, 1 Nanyang Walk, Singapore 637616.

Scientific Reports

|March 7, 2014

Summary

We developed a novel qubit system using neutral atomic currents in optical lattices. This approach offers low decoherence and robust quantum information processing, minimizing magnetic field noise.

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Area of Science:

Quantum Computing
Atomic Physics
Condensed Matter Physics

Background:

Neutral cold atom systems offer low decoherence rates.
Topologically protected solid-state Josephson flux qubits are robust but susceptible to magnetic field fluctuations.
Developing new qubit modalities is crucial for advancing quantum computing.

Purpose of the Study:

To propose and investigate an experimentally feasible qubit system using neutral atomic currents.
To combine the advantages of neutral cold atoms and Josephson flux qubits.
To demonstrate a novel qubit implementation based on atomic currents in optical lattices.

Main Methods:

Utilizing bosonic cold atoms trapped in one-dimensional ring-shaped optical lattice potentials.
Implementing tunable ring-ring interactions.
Breaking Galilean invariance to create atomic currents for qubit operation.
Investigating qubit initialization, addressing, and readout protocols.
Experimentally realizing scaled ring-lattice potentials.

Main Results:

Demonstrated a qubit implementation using atomic currents through a lattice.
Showcased two methods for qubit realization: phase slip in a single ring or tunnel coupling of two rings.
Experimentally realized scaled ring-lattice potentials capable of hosting multiple qubits.
Discussed an experimentally viable scheme for a two-qubit system.

Conclusions:

Neutral atomic currents in optical lattices provide a promising route for robust quantum computing.
The proposed system minimizes magnetic field noise inherent in flux qubits.
Experimental realization of the necessary infrastructure demonstrates feasibility.