DOE OSTI · 3013951
Photon blockade in a Tavis-Cummings system
Abstract
We observe blockade of microwave photons in a Tavis-Cummings system comprising a superconducting cavity and up to 𝑁 =3 transmon qubits. The effect is characterized with photon-number-resolving spectroscopy using an additional dispersively coupled transmon “witness” qubit to directly probe the cavity’s photon-number distribution. We first observe polariton formation with splitting proportional to $\sqrt{𝑁}$, confirming the Tavis-Cummings coupling, and subsequently obtain sub-Poissonian cavity photon statistics when the cavity is driven at polariton frequencies.
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Marinelli, Brian [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000154210829), Rubin, Alex H. [University of California, Davis, CA (United States)] (ORCID:0009000828296057), Norman, Victoria A. [University of California, Davis, CA (United States)] (ORCID:000000027093607X), Yang, Santai [University of California, Berkeley, CA (United States)] (ORCID:0009000189703540), Naik, Ravi [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000323377321), Niedzielski, Bethany M. [Massachusetts Inst. of Technology (MIT), Lexington, MA (United States). Lincoln Laboratory] (ORCID:0000000282778064), Kim, David K. [Massachusetts Inst. of Technology (MIT), Lexington, MA (United States). Lincoln Laboratory], Das, Rabindra [Massachusetts Inst. of Technology (MIT), Lexington, MA (United States). Lincoln Laboratory] (ORCID:0009000206357230), Schwartz, Mollie [Massachusetts Inst. of Technology (MIT), Lexington, MA (United States). Lincoln Laboratory] (ORCID:0000000344068974), Santiago, David I. [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)] (ORCID:0000000180745130), Spitzer, Christopher [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Siddiqi, Irfan [University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)], Radulaski, Marina [University of California, Davis, CA (United States)] (ORCID:0000000196063716). 2025-10-31. Photon blockade in a Tavis-Cummings system. https://doi.org/10.1103/st87-3cxz
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