Coherent Tunneling Adiabatic Passage with the Alternating Coupling Scheme

Abstract

The use of adiabatic passage techniques to mediate particle transport through real space, rather than phase space is becoming an interesting possibility. We have investigated the properties of Coherent Tunneling Adiabatic Passage (CTAP) with alternating tunneling matrix elements. This geometry, not previously considered in the donor in silicon paradigm, provides an interesting route to long-range quantum transport. We introduce simplified coupling protocols, and transient eigenspectra as well as a realistic gate design for this transport protocol. Using a pairwise treatment of the tunnel couplings for a 5 donor device with 30nm donor spacings, 120nm total chain length, we estimate the time scale required for adiabatic operation to be ~70ns, a time well within measured electron spin and estimated charge relaxation and times for phosphorus donors in silicon.

13 pages, 5 figures, minor revisions

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• Spatial adiabatic passage: a review of recent progress
• Atomtronics with holes: Coherent transport of an empty site in a triple well potential
• Coherent electron transport by adiabatic passage in an imperfect donor chain
• Coherent tunneling via adiabatic passage in a three-well Bose-Hubbard system
• Coherent control of indirect excitonic qubits in optically driven quantum dot molecules
• Coherent Tunneling by Adiabatic Passage of an exchange-only spin qubit in a double quantum dot chain
• Interferometry using spatial adiabatic passage in quantum dot networks
• Spin-selective electron transfer in quantum dot array
• Dark State Adiabatic Passage with spin-one particles
• Coherent transfer by adiabatic passage in two-dimensional lattices
• Long-range coupling of silicon photonic waveguides using lateral leakage and adiabatic passage
• Robust Multiple-Range Coherent Quantum State Transfer
• Parallel interaction-free measurement using spatial adiabatic passage
• Digital Waveguide Adiabatic Passage Part 1: Theory