Tripartite interactions between two phase qubits and a resonant cavity

Abstract

The creation and manipulation of multipartite entangled states is important for advancements in quantum computation and communication, and for testing our fundamental understanding of quantum mechanics and precision measurements. Multipartite entanglement has been achieved by use of various forms of quantum bits (qubits), such as trapped ions, photons, and atoms passing through microwave cavities. Quantum systems based on superconducting circuits have been used to control pair-wise interactions of qubits, either directly, through a quantum bus, or via controllable coupling. Here, we describe the first demonstration of coherent interactions of three directly coupled superconducting quantum systems, two phase qubits and a resonant cavity. We introduce a simple Bloch-sphere-like representation to help one visualize the unitary evolution of this tripartite system as it shares a single microwave photon. With careful control and timing of the initial conditions, this leads to a protocol for creating a rich variety of entangled states. Experimentally, we provide evidence for the deterministic evolution from a simple product state, through a tripartite W-state, into a bipartite Bell-state. These experiments are another step towards deterministically generating multipartite entanglement in superconducting systems with more than two qubits.

References in corpus (8)

• Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
• Quantum information processing with circuit quantum electrodynamics
• Coherent quantum state storage and transfer between two phase qubits via a resonant cavity
• Preparation and Measurement of Three-Qubit Entanglement in a Superconducting Circuit
• Generation of Three-Qubit Entangled States using Superconducting Phase Qubits
• Dressed Collective Qubit States and the Tavis-Cummings Model in Circuit QED
• Wrapped branes as qubits
• Maximally entangling tripartite protocols for Josephson phase qubits

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• Quantum memory using a hybrid circuit with flux qubits and NV centers
• Sampling-based Learning Control for Quantum Systems with Uncertainties
• Circuit QED scheme for realization of the Lipkin-Meshkov-Glick model
• Resonator/zero-Qubit architecture for superconducting qubits
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• Coupling qubits in circuit-QED cavities connected by a bridge qubit
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• Hybrid quantum surface acoustic wave with skyrmion qubit for quantum information processing
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