Reservoir-engineering shortcuts to adiabaticity
We propose a protocol that achieves fast adiabatic transfer between two orthogonal states of a qubit by coupling with an ancilla. The qubit undergoes Landau-Zener dynamics, whereas the coupling realizes a time-dependent Hamiltonian, which is diagonal in the spin's instantaneous Landau-Zener eig...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
American Physical Society
2022-07-01
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| Series: | Physical Review Research |
| Online Access: | http://doi.org/10.1103/PhysRevResearch.4.033005 |
| _version_ | 1827285459729907712 |
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| author | Raphaël Menu Josias Langbehn Christiane P. Koch Giovanna Morigi |
| author_facet | Raphaël Menu Josias Langbehn Christiane P. Koch Giovanna Morigi |
| author_sort | Raphaël Menu |
| collection | DOAJ |
| description | We propose a protocol that achieves fast adiabatic transfer between two orthogonal states of a qubit by coupling with an ancilla. The qubit undergoes Landau-Zener dynamics, whereas the coupling realizes a time-dependent Hamiltonian, which is diagonal in the spin's instantaneous Landau-Zener eigenstates. The ancilla (or meter), in turn, couples to a thermal bath such that the overall dynamics is incoherent. We analyze the protocol's fidelity as a function of the strength of the coupling and of the relaxation rate of the meter. When the meter's decay rate is the largest frequency scale of the dynamics, the spin dynamics is encompassed by a master equation describing dephasing of the spin in the instantaneous eigenbasis. In this regime, the fidelity of adiabatic transfer improves as the bath temperature is increased. Surprisingly, the adiabatic transfer is significantly more efficient in the opposite regime, where the timescale of the ancilla dynamics is comparable to the characteristic spin timescale. Here, for low temperatures the coupling with the ancilla tends to suppress diabatic transitions via effective cooling. The protocol can be efficiently implemented by means of a pulsed, stroboscopic coupling with the ancilla and is robust against moderate fluctuations of the experimental parameters. |
| first_indexed | 2024-04-24T10:15:06Z |
| format | Article |
| id | doaj.art-5bfaeb92e82a4bd3b6b921d1e837e243 |
| institution | Directory Open Access Journal |
| issn | 2643-1564 |
| language | English |
| last_indexed | 2024-04-24T10:15:06Z |
| publishDate | 2022-07-01 |
| publisher | American Physical Society |
| record_format | Article |
| series | Physical Review Research |
| spelling | doaj.art-5bfaeb92e82a4bd3b6b921d1e837e2432024-04-12T17:22:26ZengAmerican Physical SocietyPhysical Review Research2643-15642022-07-014303300510.1103/PhysRevResearch.4.033005Reservoir-engineering shortcuts to adiabaticityRaphaël MenuJosias LangbehnChristiane P. KochGiovanna MorigiWe propose a protocol that achieves fast adiabatic transfer between two orthogonal states of a qubit by coupling with an ancilla. The qubit undergoes Landau-Zener dynamics, whereas the coupling realizes a time-dependent Hamiltonian, which is diagonal in the spin's instantaneous Landau-Zener eigenstates. The ancilla (or meter), in turn, couples to a thermal bath such that the overall dynamics is incoherent. We analyze the protocol's fidelity as a function of the strength of the coupling and of the relaxation rate of the meter. When the meter's decay rate is the largest frequency scale of the dynamics, the spin dynamics is encompassed by a master equation describing dephasing of the spin in the instantaneous eigenbasis. In this regime, the fidelity of adiabatic transfer improves as the bath temperature is increased. Surprisingly, the adiabatic transfer is significantly more efficient in the opposite regime, where the timescale of the ancilla dynamics is comparable to the characteristic spin timescale. Here, for low temperatures the coupling with the ancilla tends to suppress diabatic transitions via effective cooling. The protocol can be efficiently implemented by means of a pulsed, stroboscopic coupling with the ancilla and is robust against moderate fluctuations of the experimental parameters.http://doi.org/10.1103/PhysRevResearch.4.033005 |
| spellingShingle | Raphaël Menu Josias Langbehn Christiane P. Koch Giovanna Morigi Reservoir-engineering shortcuts to adiabaticity Physical Review Research |
| title | Reservoir-engineering shortcuts to adiabaticity |
| title_full | Reservoir-engineering shortcuts to adiabaticity |
| title_fullStr | Reservoir-engineering shortcuts to adiabaticity |
| title_full_unstemmed | Reservoir-engineering shortcuts to adiabaticity |
| title_short | Reservoir-engineering shortcuts to adiabaticity |
| title_sort | reservoir engineering shortcuts to adiabaticity |
| url | http://doi.org/10.1103/PhysRevResearch.4.033005 |
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