Collective quantum phase slips in multiple nanowire junctions
arXiv:1406.6815 · doi:10.1103/PhysRevA.99.012309
Abstract
Realization of robust coherent quantum phase slips represents a significant experimental challenge. Here we propose a new design consisting of multiple nanowire junctions to realize a phase-slip flux qubit. It admits good tunability provided by gate voltages applied on superconducting islands separating nanowire junctions. In addition, the gates and junctions can be identical or distinct to each other leading to symmetric and asymmetric setups. We find that the asymmetry can improve the performance of the proposed device, compared with the symmetric case. In particular, it can enhance the effective rate of collective quantum phase slips. Furthermore, we demonstrate how to couple two such devices via a mutual inductance. This is potentially useful for quantum gate operations. Our investigation on how symmetry in multiple nanowire junctions affects the device performance should be useful for the application of phase-slip flux qubits in quantum information processing and quantum metrology.
12 pages, 6 figures
References in corpus (16)
- Charge insensitive qubit design derived from the Cooper pair box
- Quantum simulation of a Fermi-Hubbard model using a semiconductor quantum dot array
- Low-decoherence flux qubit
- Coherent Flux Tunneling Through NbN Nanowires
- Insulating Josephson-junction chains as pinned Luttinger liquids
- NbSi nanowire quantum-phase-slip circuits: dc supercurrent blockade, microwave measurements and thermal analysis
- Determination of the Superconductor-Insulator Phase Diagram for One-Dimensional Wires
- A fluxonium-based artificial molecule with a tunable magnetic moment
- Spectroscopic Evidence of the Aharonov-Casher effect in a Cooper Pair Box
- Formation of Quantum Phase Slip Pairs in Superconducting Nanowires
- Quantum Phase Slips in one-dimensional Josephson Junction Chains
- Coherent dynamics and decoherence in a superconducting weak link
- Quantum Phase-Slip Junction Under Microwave Irradiation
- Theory of coherent quantum phase-slips in Josephson junction chains with periodic spatial modulations
- Quantum Phase Slips: from condensed matter to ultracold quantum gases
- Single Flux Transistor: the controllable interplay of Coherent Quantum Phase Slip and Flux quantization