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Silicon Metal-oxide-semiconductor Quantum Dots for Single-electron Pumping

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Fermi problem with artificial atoms in circuit QED.

Carlos Sabín¹, Marco del Rey, Juan José García-Ripoll

¹Instituto de Física Fundamental, CSIC, Serrano 113-B, 28006 Madrid, Spain.

Physical Review Letters

|November 24, 2011

Summary

This study demonstrates strict causality in a quantum system using superconducting qubits. It shows qubit excitation is independent of others until signals arrive, resolving apparent causality paradoxes.

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Area of Science:

Quantum physics
Quantum information science
Condensed matter physics

Background:

The Fermi problem explores causality in quantum systems with interacting particles.
Previous interpretations suggested apparent causality violations in Fermi's two-atom system.
Superconducting qubits offer a platform for testing fundamental quantum phenomena.

Purpose of the Study:

To propose and theoretically validate an experimental test of the Fermi problem in one dimension.
To rigorously prove strict causality in this quantum system.
To reconcile nonlocal correlations with causality in quantum mechanics.

Main Methods:

Utilizing superconducting qubits to model a 1D quantum field.
Developing an explicit nonperturbative proof for strict causality.
Analyzing the probability of excitation for a two-level artificial atom coupled to a quantum field.

Main Results:

Demonstrated strict causality in the 1D Fermi problem using superconducting qubits.
Proved that qubit excitation is independent of other qubits until signal arrival.
Showed agreement between strict causality and the existence of nonlocal correlations.

Conclusions:

The proposed experimental setup is feasible for testing the Fermi problem.
Strict causality holds in this quantum system, contrary to some prior claims.
Nonlocal correlations are compatible with causality in quantum mechanics.