NSQUID arrays as conveyers of quantum information

Abstract

We have considered the quantum dynamics of an array of nSQUIDs -- two-junction SQUIDs with negative mutual inductance between their two arms. Effective dual-rail structure of the array creates additional internal degree of freedom for the fluxons in the array, which can be used to encode and transport quantum information. Physically, this degree of freedom is represented by electromagnetic excitations localized on the fluxon. We have calculated the spatial profile and frequency spectrum of these excitations. Their dynamics can be reduced to two quantum states, so that each fluxons moving through the array carries with it a qubit of information. Coherence properties of such a propagating qubits in the nSQUID array are characterized by the dynamic suppression of the low-frequency decoherence due to the motion-induced spreading of the noise spectral density to a larger frequency interval.

arXiv comment10 pages, 3 figures

References in corpus (28)

• Logic gates at the surface code threshold: Superconducting qubits poised for fault-tolerant quantum computing
• Observation of high coherence in Josephson junction qubits measured in a three-dimensional circuit QED architecture
• Coherent quantum state storage and transfer between two phase qubits via a resonant cavity
• Dynamically protected cat-qubits: a new paradigm for universal quantum computation
• Generation of Three-Qubit Entangled States using Superconducting Phase Qubits
• Implementation of a Toffoli Gate with Superconducting Circuits
• Stabilizing entanglement autonomously between two superconducting qubits
• Implementing the Quantum von Neumann Architecture with Superconducting Circuits
• Quantum Process Tomography of a Universal Entangling Gate Implemented with Josephson Phase Qubits
• Model for l/f Flux Noise in SQUIDs and Qubits
• Experimental Demonstration of a Robust and Scalable Flux Qubit
• Microscopic origin of low frequency flux noise in Josephson circuits
• Dangling-bond spin relaxation and magnetic 1/f noise from the amorphous-semiconductor/oxide interface: Theory
• Tunable Quantum Beam Splitters for Coherent Manipulation of a Solid-State Tripartite Qubit System
• Spectroscopy of low-frequency noise and its temperature dependence in a superconducting qubit
• Experimental determination of Ramsey numbers
• Solid-State Quantum Communication With Josephson Arrays
• Probing Noise in Flux Qubits via Macroscopic Resonant Tunneling
• Geometrical dependence of low frequency noise in superconducting flux qubits
• Spin chains for robust state transfer: Modified boundary couplings vs. completely engineered chains
• Rapid Ballistic Readout for Flux Qubits
• Fluxon readout of a superconducting qubit
• Quantum state transfer in arrays of flux qubits
• Theoretical analysis of perfect quantum state transfer with superconducting qubits
• Exploiting boundary states of imperfect spin chains for high-fidelity state transfer
• Correlated flux noise and decoherence in two inductively coupled flux qubits
• Josephson vortex coupled to a flux qubit
• Propagation of local excitations through strongly correlated quantum chains

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