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1. Dissipative Cavity Solitons at the Boundaries of a Topological Lattice

   https://doi.org/10.1364/CLEO_FS.2023.FM2B.7  

   Leefmans, Christian; Englebert, Nicolas; Williams, James; Goldman, Nathan; Gorza, Simon-Pierre; Leo, Franc¸ois; Marandi, Alireza (January 2023, Optica Publishing Group)

   We experimentally observe the formation of dissipative cavity solitons at the boundaries of a topological lattice. Our work reveals new opportunities to study both nonlinear topological photonics and dissipative cavity solitons in coupled resonator arrays. 

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2. Site-dependent selection of atoms for homogeneous atom-cavity coupling

   https://doi.org/10.48550/arXiv.2104.01201  

   Wu, B.; Greve, G. P.; Luo, C.; Thompson, J.K. (October 2022, ArXivorg)

   We demonstrate a method to obtain homogeneous atom-cavity coupling by selecting and keeping 87Rb atoms that are near maximally coupled to the cavity's standing-wave mode. We select atoms by imposing an AC Stark shift on the ground state hyperfine microwave transition frequency with light injected into the cavity. We then induce a spin flip with microwaves that are resonant for atoms that are near maximally coupled to the cavity mode of interest, after which, we use radiation pressure forces to remove from the cavity all the atoms in the initial spin state. Achieving greater homogeneity in the atom-cavity coupling will potentially enhance entanglement generation, intracavity driving of atomic transitions, cavity-optomechanics, and quantum simulations. This approach can easily be extended to other atomic species with microwave or optical transitions. 

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3. A polarization encoded photon-to-spin interface

   https://doi.org/10.1038/s41534-020-00337-3  

   Chen, K. C.; Bersin, E.; Englund, D. (December 2021, npj Quantum Information)

   null (Ed.)

   Abstract We propose an integrated photonics device for mapping qubits encoded in the polarization of a photon onto the spin state of a solid-state defect coupled to a photonic crystal cavity: a “polarization-encoded photon-to-spin interface” (PEPSI). We perform a theoretical analysis of the state fidelity’s dependence on the device’s polarization extinction ratio and atom–cavity cooperativity. Furthermore, we explore the rate-fidelity trade-off through analytical and numerical models. In simulation, we show that our design enables efficient, high fidelity photon-to-spin mapping. 

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4. Thermal intermodulation backaction in a high-cooperativity optomechanical system

   https://doi.org/10.1364/OPTICA.500123  

   Pluchar, Christian_M; Agrawal, Aman_R; Wilson, Dalziel_J (November 2023, Optica)

   The pursuit of room temperature quantum optomechanics with tethered nanomechanical resonators faces stringent challenges owing to extraneous mechanical degrees of freedom. An important example is thermal intermodulation noise (TIN), a form of excess optical noise produced by mixing of thermal noise peaks. While TIN can be decoupled from the phase of the optical field, it remains indirectly coupled via radiation pressure, implying a hidden source of backaction that might overwhelm shot noise. Here we report observation of TIN backaction in a high-cooperativity, room temperature cavity optomechanical system consisting of an acoustic-frequency Si₃N₄trampoline coupled to a Fabry–Perot cavity. The backaction we observe exceeds thermal noise by 20 dB and radiation pressure shot noise by 40 dB, despite the thermal motion being 10 times smaller than the cavity linewidth. Our results suggest that mitigating TIN may be critical to reaching the quantum regime from room temperature in a variety of contemporary optomechanical systems. 

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5. Photon-mediated interactions between quantum emitters in a diamond nanocavity

   https://doi.org/10.1126/science.aau4691  

   Evans, R. E.; Bhaskar, M. K.; Sukachev, D. D.; Nguyen, C. T.; Sipahigil, A.; Burek, M. J.; Machielse, B.; Zhang, G. H.; Zibrov, A. S.; Bielejec, E.; et al (September 2018, Science)

   Photon-mediated interactions between quantum systems are essential for realizing quantum networks and scalable quantum information processing. We demonstrate such interactions between pairs of silicon-vacancy (SiV) color centers coupled to a diamond nanophotonic cavity. When the optical transitions of the two color centers are tuned into resonance, the coupling to the common cavity mode results in a coherent interaction between them, leading to spectrally resolved superradiant and subradiant states. We use the electronic spin degrees of freedom of the SiV centers to control these optically mediated interactions. Such controlled interactions will be crucial in developing cavity-mediated quantum gates between spin qubits and for realizing scalable quantum network nodes. 

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