Journal
PHYSICAL REVIEW B
Volume 87, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.87.064506
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Funding
- Caltech Summer Undergraduate Research Experience program
- Rose Hills foundation
- Lee A. DuBridge fellowship
- Sherman Fairchild Foundation
- DARPA-QuEST program
- IQIM
- Alexander von Humboldt Foundation
- Erdal Inonu chair
- TUBITAK [110T841]
- Division Of Physics
- Direct For Mathematical & Physical Scien [1125565] Funding Source: National Science Foundation
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We study phase slips in one-dimensional topological superconducting wires. These wires have been proposed as building blocks for topologically protected qubits in which the quantum information is distributed over the length of the device and thus is immune to local sources of decoherence. However, phase slips are nonlocal events that can result in decoherence. Phase slips in topological superconductors are peculiar for the reason that they occur in multiples of 4 pi (instead of 2 pi in conventional superconductors). We reestablish this fact via a beautiful analogy to the particle physics concept of dynamic symmetry breaking by explicitly finding a hidden zero mode in the fermion spectrum computed in the background of a 2 pi phase slip. Armed with the understanding of phase slips in topological superconductors, we propose a simple experimental setup with which the predictions can be tested by monitoring the tunneling rate of a superconducting flux quantum through a topological superconducting wire. DOI: 10.1103/PhysRevB.87.064506
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