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Journal of the Optical Society of America B

Coherent control of microwave pulse propagation based on gain assisted electromagnetically induced transparency in superconducting circuits

M. Q. Ayaz, Sajid Qamar, Shahid Qamar

Published Sep 16, 2020• 0 citations
Publisher

Abstract

Based on gain assisted electromagnetically induced transparency (EIT), we propose a scheme for coherent manipulation and storage of a microwave pulse propagating through a linear array of superconducting artificial atoms (SAAs). In an EIT-based system, the signal operates in an absorption mode, and its attenuation cannot be avoided during propagation. This results in low transmissivity of the medium. We show that based on gain assisted EIT, the attenuation can be ameliorated, and a probe pulse can be amplified while it propagates through the medium with significant reduction in its group velocity. The linear array of SAAs can thus act as a gain assisted EIT-based coherent microwave memory scheme with high fidelity.

DOI
10.1364/josab.399961

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Based on gain assisted electromagnetically induced transparency (EIT), we propose a scheme for coherent manipulation and storage of a microwave pulse propagating through a linear array of superconducting artificial atoms (SAAs). In an EIT-based system, the signal operates in an absorption mode, and its attenuation cannot be avoided during propagation. This results in low transmissivity of the medium. We show that based on gain assisted EIT, the attenuation can be ameliorated, and a probe pulse can be amplified while it propagates through the medium with significant reduction in its group velocity. The linear array of SAAs can thus act as a gain assisted EIT-based coherent microwave memory scheme with high fidelity.
In this paper we propose a scheme for coherent control and storage of a microwave pulse in superconducting circuits exploiting the idea of electromagnetically induced transparency (EIT) and the Aulter-Townes (AT) effect. We show that superconducting artificial atoms in a four-level tripod configuration act as EIT based coherent microwave $(\ensuremath{\mu}\mathrm{w})$ memories with gain features, when they are attached to a one-dimensional transmission line. These atoms are allowed to interact with three microwave fields, such that there are two control fields and one probe field. Our proposed system works in such a way that one control field with large Rabi frequency when interacting with atoms, produces the AT effect. While the second control field with relatively small Rabi frequency produces EIT in one of the absorption windows produced due to the AT splitting for the weak probe field. The group velocity of the probe pulse reduces significantly through this EIT window. Interestingly, the output intensity of the probe pulse increases as we increase the number of artificial atoms. Our results show that the probe microwave pulse can be stored and retrieved with high fidelity.
Abstract We study the coherent propagation of a microwave pulse through a one-dimensional array of artificial atoms. The scheme is based upon gain assisted propagation of the pulse using two-photon Raman transition in a three-level superconducting artificial atoms (SAAs) coupled to a microwave transmission line. Our results show that the group velocity can be significantly reduced by increasing the Rabi frequency of the pump fields which in turn can lead to an efficient storage of the pulse inside a 1D array of SAAs. Further, the intensity of the transmitted pulse increases with the number of artificial atoms owing to the gain associated with the two-photon Raman transition. Our results also show that the window width decreases for both scattering and negligible scattering cases with the increase in the number of SAAs. The fidelity of the system also remains high even after the passage of the pulse through a large number of SAAs.
We present experimental observation of electromagnetically induced transparency (EIT) on a single macroscopic artificial "atom" (superconducting quantum system) coupled to open 1D space of a transmission line. Unlike in an optical media with many atoms, the single-atom EIT in 1D space is revealed in suppression of reflection of electromagnetic waves, rather than absorption. The observed almost 100% modulation of the reflection and transmission of propagating microwaves demonstrates full controllability of individual artificial atoms and a possibility to manipulate the atomic states. The system can be used as a switchable mirror of microwaves and opens a good perspective for its applications in photonic quantum information processing and other fields.
Abstract We present a scheme for the amplification of electromagnetically induced acoustic transparency (EIAT) in a superconducting transmon circuit. Recently, EIAT has been demonstrated experimentally in a three-level ladder-type superconducting artificial atom [G Andersson et al, Phys. Rev. Lett. 124, 240 402 (2020)]. In this experiment, the authors have noticed only 20% transmission of surface acoustic waves (SAW) due to limited linewidth of the EIT window. Here we utilize an additional microwave field to enhance the transmission of SAW. This additional field increases the coherence in the second excited state which causes the amplification in transmission and the reduction in corresponding group velocity is achieved.
Three-level Lambda systems provide a versatile platform for quantum optical phenomena such as Electromagnetically Induced Transparency (EIT), slow light, and quantum memory. Such Lambda systems have been realized in several quantum hardware platforms including atomic systems, superconducting artificial atoms, and meta-structures. Previous experiments involving superconducting artificial atoms incorporated coupling to additional degrees of freedom, such as resonators or other superconducting atoms. In this work, we performed an EIT experiment in microwave frequency range utilizing a single Fluxonium qubit within a microwave waveguide. The Lambda system is consisted of two plasmon transitions in combination with one metastable state originating from the fluxon transition. In this configuration, the controlling and probing transitions are strongly coupled to the transmission line, safeguarding the transition between 0 and 1 states, and ensuring the Fluxonium qubit is close to the sweet spot. Our observations include the manifestation of EIT, a slowdown of light with a delay time of 217 ns, and photon storage. These results highlight the potential as a phase shifter or quantum memory for quantum communication in superconducting circuits.