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Berry phase in superconducting charge qubits interacting with a cavity field

Mahmoud Abdel‐Aty

arXiv:0903.1102Physics Letters AAug 19, 200912 citations

Observable Berry Phase for Charge Qubit in a Dissipative Environment

Zhen Wang, Yuanhua Li, Hualan Xu +5 more

International Journal of Theoretical PhysicsApr 19, 201212 citations

Probing superconducting phase qubits

Jürgen Lisenfeld, C. Coqui, Alexander V. Lukashenko +3 more

Verhandlungen der Deutschen Physikalischen GesellschaftJan 1, 20050 citations

Observation of Berry's Phase in a Solid-State Qubit

Peter Leek, J. M. Fink, Alexandre Blais +7 more

In quantum information science, the phase of a wave function plays an important role in encoding information. Although most experiments in this field rely on dynamic effects to manipulate this information, an alternative approach is to use geometric phase, which has been argued to have potential fault tolerance. We demonstrated the controlled accumulation of a geometric phase, Berry's phase, in a superconducting qubit; we manipulated the qubit geometrically by means of microwave radiation and observed the accumulated phase in an interference experiment. We found excellent agreement with Berry's predictions and also observed a geometry-dependent contribution to dephasing.In quantum information science, the phase of a wave function plays an important role in encoding information. Although most experiments in this field rely on dynamic effects to manipulate this information, an alternative approach is to use geometric phase, which has been argued to have potential fault tolerance. We demonstrated the controlled accumulation of a geometric phase, Berry's phase, in a superconducting qubit; we manipulated the qubit geometrically by means of microwave radiation and observed the accumulated phase in an interference experiment. We found excellent agreement with Berry's predictions and also observed a geometry-dependent contribution to dephasing.

arXiv:0711.0218ScienceNov 22, 2007376 citations

Phase Qubit on a Superconducting

I. N. Askerzade, Emrah Amrahov

Jan 1, 20100 citations

Exploring the effect of noise on the Berry phase

S. Berger, Marek Pechal, A. A. Abdumalikov +5 more

We experimentally investigate the effects of noise on the adiabatic and cyclic geometric phase, also termed the Berry phase. By introducing artificial fluctuations in the path of the control field, we measure the geometric contribution to dephasing of an effective two-level system for a variety of noise powers and different paths. Our results, measured using a microwave-driven superconducting qubit, clearly show that only fluctuations which distort the path lead to geometric dephasing. In a direct comparison with the dynamic phase, which is path independent, we observe that the Berry phase is less affected by noise-induced dephasing. This observation directly points towards the potential of geometric phases for quantum gates or metrological applications.We experimentally investigate the effects of noise on the adiabatic and cyclic geometric phase, also termed the Berry phase. By introducing artificial fluctuations in the path of the control field, we measure the geometric contribution to dephasing of an effective two-level system for a variety of noise powers and different paths. Our results, measured using a microwave-driven superconducting qubit, clearly show that only fluctuations which distort the path lead to geometric dephasing. In a direct comparison with the dynamic phase, which is path independent, we observe that the Berry phase is less affected by noise-induced dephasing. This observation directly points towards the potential of geometric phases for quantum gates or metrological applications.

arXiv:1302.3305Physical Review AJun 26, 2013101 citations

Observation of Berry's Phase in a Superconducting Qubit

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