Generation and control of Greenberger-Horne-Zeilinger entanglement in superconducting circuits

Abstract

Going beyond the entanglement of microscopic objects (such as photons, spins, and ions), here we propose an efficient approach to produce and control the quantum entanglement of three macroscopic coupled superconducting qubits. By conditionally rotating, one by one, selected Josephson charge qubits, we show that their Greenberger-Horne-Zeilinger (GHZ) entangled states can be deterministically generated. The existence of GHZ correlations between these qubits could be experimentally demonstrated by effective single-qubit operations followed by high-fidelity single-shot readouts. The possibility of using the prepared GHZ correlations to test the macroscopic conflict between the noncommutativity of quantum mechanics and the commutativity of classical physics is also discussed.

4 Pages with 1 figure. to appear in Physical Review Letters

References in corpus (8)

• Superconducting Circuits and Quantum Information
• Demonstration of conditional gate operation using superconducting charge qubits
• Single-shot measurement of the Josephson charge qubit
• Quantum computation with Josephson-qubits by using a current-biased information bus
• Macroscopic Einstein-Podolsky-Rosen pairs in superconducting circuits
• Testing Bell's inequality in constantly coupled Josephson circuits by effective single-qubit operations
• Quantum tomography for solid state qubits
• Quantum logic operations and creation of entanglement in a scalable superconducting quantum computer with long-range constant interaction between qubits

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• Multiphoton Quantum Rabi Oscillations in Ultrastrong Cavity QED
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• Circuit QED and engineering charge based superconducting qubits
• Proposal for generating and detecting multi-qubit GHZ states in circuit QED
• One-step multi-qubit GHZ state generation in a circuit QED system
• Simple preparation of Bell and GHZ states using ultrastrong-coupling circuit QED
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• Fully-connected network of superconducting qubits in a cavity
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• Measurement-based Synthesis of multi-qubit Entangled States in Superconducting Cavity QED
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• Protecting entanglement in superconducting qubits
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• Maximally entangling tripartite protocols for Josephson phase qubits
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• Greenberger-Horne-Zeilinger states and few-body Hamiltonians
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• Controllable entanglement preparations between atoms in spatially-separated cavities via quantum Zeno dynamics
• Feedback Ansatz for Adaptive-Feedback Quantum Metrology Training with Machine Learning
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• Entangling distant systems via universal nonadiabatic passage
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• Heisenberg-Limited Spin-Mechanical Gravimetry
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