期刊
PHYSICA SCRIPTA
卷 93, 期 5, 页码 -出版社
IOP PUBLISHING LTD
DOI: 10.1088/1402-4896/aab084
关键词
three-level superconducting quantum circuits; non-adiabatic geometric gates; quantum state manipulation
资金
- Academy of Finland [263457, 250280, 312296]
- Center for Quantum Engineering at Aalto University (project QMET)
- Center for Quantum Engineering at Aalto University (project QMETRO)
- Vaisala Foundation
- Academy of Finland (AKA) [263457, 312296, 263457, 312296] Funding Source: Academy of Finland (AKA)
Quantum state manipulation with gates based on geometric phases acquired during cyclic operations promises inherent fault-tolerance and resilience to local fluctuations in the control parameters. Here we create a general non-Abelian and non-adiabatic holonomic gate acting in the (vertical bar 0 >,vertical bar 2 >) subspace of a three-level (qutrit) transmon device fabricated in a fully coplanar design. Experimentally, this is realized by simultaneously coupling the first two transitions by microwave pulses with amplitudes and phases defined such that the condition of parallel transport is fulfilled. We demonstrate the creation of arbitrary superpositions in this subspace by changing the amplitudes of the pulses and the relative phase between them. We use two-photon pulses acting in the holonomic subspace to reveal the coherence of the state created by the geometric gate pulses and to prepare different superposition states. We also test the action of holonomic NOT and Hadamard gates on superpositions in the (vertical bar 0 >, vertical bar 2 >) subspace.
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