2019
DOI: 10.1103/physrevlett.123.233602
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Large Collective Lamb Shift of Two Distant Superconducting Artificial Atoms

Abstract: Virtual photons can mediate interaction between atoms, resulting in an energy shift known as a collective Lamb shift. Observing the collective Lamb shift is challenging, since it can be obscured by radiative decay and direct atom-atom interactions. Here, we place two superconducting qubits in a transmission line terminated by a mirror, which suppresses decay. We measure a collective Lamb shift reaching 0.8% of the qubit transition frequency and exceeding the transition linewidth. We also show that the qubits c… Show more

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Cited by 80 publications
(44 citation statements)
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“…In this work, we probe a superconducting transmon qubit coupled directly to the end of an open transmission line. In previous realizations [6][7][8][33][34][35] , the coupling rates were much larger than intrinsic decoherence mechanisms of the qubit, so the effects of non-radiative decay and pure dephasing were small and could not be well characterized. Here, we investigate a qubit whose radiative decay rate into the transmission line is larger than, yet comparable to, other decoherence mechanisms.…”
Section: Introductionmentioning
confidence: 98%
“…In this work, we probe a superconducting transmon qubit coupled directly to the end of an open transmission line. In previous realizations [6][7][8][33][34][35] , the coupling rates were much larger than intrinsic decoherence mechanisms of the qubit, so the effects of non-radiative decay and pure dephasing were small and could not be well characterized. Here, we investigate a qubit whose radiative decay rate into the transmission line is larger than, yet comparable to, other decoherence mechanisms.…”
Section: Introductionmentioning
confidence: 98%
“…5), allows interaction even if one (but not both) of the atoms is prevented from relaxing into the waveguide. This has recently been confirmed in an experiment (Wen et al 2019) with superconducting qubits in a transmission-line waveguide, and expanded upon in a connected theoretical study .…”
Section: Multiple Giant Atomsmentioning
confidence: 56%
“…It is possible to engineer frequency-dependent relaxation rates and Lamb shifts also for small atoms. This can be achieved by placing a small atom in front of a mirror instead of in an open waveguide, a setup which has been considered in several theoretical (Meschede et al 1990;Dorner and Zoller 2002;Beige et al 2002;Dong et al 2009;Koshino and Nakamura 2012;Wang et al 2012;Tufarelli et al 2013;Fang and Baranger 2015;Shi et al 2015;Pichler and Zoller 2016) and experimental works (Eschner et al 2001;Wilson et al 2003;Dubin et al 2007;Hoi et al 2015;Wen et al 2018Wen et al , 2019. Here, the atomic relaxation can be enhanced or suppressed by interference with the mirror image of the atom.…”
Section: Comparison With An Atom In Front Of a Mirrormentioning
confidence: 99%
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