Spectral Reconfiguration of Single Photons with a Modulated Quantum EmitterDynamically modulation of a two-level system that is coupled to a nanophotonic waveguide is recently shown to have novel properties for spectral engineering. Using scattering matrix formalism for time-periodic Hamiltonian, it has been demonstrated that it is possible to reconfigure the transmission spectrum of the emitter by engineering the modulation. We are interested in using a single quantum dot modulated by a surface acoustic wave to engineer the spectrum of the scattered photon, and exploring more interesting physics with this capability. References:
[1] D. M. Lukin, A. D. White, M. A. Guidry, R. Trivedi et.al., Spectrally reconfigurable quantum emitters enabled by optimized fast modulation, npj Quantum Information 6, 80 (2020). [2] R. Trivedi, A. White, S. Fan, and J. Vučković, Analytic and geometric properties of scattering from periodically modulated quantum-optical systems, Phys. Rev. A 102, 033707 (2020). [3] R. Trivedi, K. Fischer, S. Xu, S. Fan, and J. Vučković, Few-photon scattering and emission from low-dimensional quantum systems, Phys. Rev. B 98, 144112 (2018). [4] S. Xu and S. Fan, Input-output formalism for few-photon transport: A systematic treatment beyond two photons, Phys. Rev. A 91, 043845 (2015). |
Performance Analysis of One-Way Quantum RepeatersOne-way quantum repeaters based on photonic cluster states have been proposed recently, which are believed to be another candidates of quantum repeaters for long-distance quantum communication besides the matter-qubit-based protocol. These all-optical protocols involve repeater graph states and tree states, whose generation has been a big challenge. We proposed to use a single quantum emitter to generate these tree-like photonic cluster states. We analyze the performance, including the loss and logical error correction capabilities, of the quantum repeater protocols using our generation scheme, and demonstrate that our generation protocol can improve the performance and lower the resource requirements significantly with strongly-coupled atom-photon interfaces, therefore paves the way to practical all-optical quantum communication. References:
[1] K. Azuma, K. Tamaki, and H.-K. Lo, All-photonic quantum repeaters, Nature Communications 6, 6787 (2015). [2] J. Borregaard, H. Pichler, T. Schröder, M. D. Lukin, P. Lodahl, and A. S. Sørensen, One-way quantum repeater based on near-deterministic photon-emitter interfaces, Phys. Rev. X 10, 021071 (2020).. [3] P. Hilaire, E. Barnes, and S. E. Economou, Resource requirements for efficient quantum communication using all-photonic graph states generated from a few matter qubits, arXiv:2005.07198 [quant-ph]. |
Photonic Cluster State Generation from a Single Quantum EmitterI explore how to use the minimum number of matter quantum emitters to generate special photonic cluster states, such as tree-cluster states and repeater graph states (RGS), for loss tolerant quantum communication and computation. Specifically, by introducing time-delayed feedback, we are able to use only one single quantum emitter to generate tree-cluster states with randomly customized branching parameters, which can be used as all-photonic quantum repeaters for quantum communication. This significantly increases the transmission rate of communication and is robust against photon loss, so that is important for building the quantum network. Possible experimental implementations include quantum dots in semiconductors, color centers in diamonds, neutral trapped atoms in optical cavities. References:
[1] K. Azuma, K. Tamaki, and H.-K. Lo, All-photonic quantum repeaters, Nature Communications 6, 6787 (2015). [2] N. H. Lindner, and T. Rudolph, Proposal for pulsed on-demand sources of photonic cluster state strings, Phys. Rev. Lett. 103, 113602 (2009). [3] H. Pichler, S. Choi, P. Zoller, and M. D. Lukin, Universal quantum computation via time-delayed feedback, PNAS 114 (43), 11362-11367 (2017). [4] S.-S. Xu, and S.-H. Fan, Generate tensor network state by sequential single-photon scattering in waveguide QED systems, APL Photonics 3, 116102 (2018). [5] D. Buterakos, E. Barnes, and S. E. Economou, Deterministic generation of all-photonic quantum repeaters from solid-state emitters, Phys. Rev. X 7, 041023 (2017). [6] A. Russo, E. Barnes, and S. E. Economou, Photonic graph state generation from quantum dots and color centers for quantum communications, Phys. Rev. B 98, 085803 (2018). [7] J. Borregaard, H. Pichler, T. Schröder, M. D. Lukin, P. Lodahl, and A. S. Sørensen, One-way quantum repeater based on near-deterministic photon-emitter interfaces, Phys. Rev. X 10, 021071 (2020).. |
Quantum Simulation in a Shaken Honeycomb Optical LatticeOptical lattice systems with cold atoms are ideal platforms for quantum simulation. Owing to the high controllability with lasers, we are able to simulate condensed matter systems and many interesting theoretical models using cold atoms. One of the commonly used experimental methods is to spatially shake the optical lattice with certain geometry. By carefully choosing the shaking amplitude and phase, a shaken honeycomb optical lattice is of great interest to scientists. The shaking can introduce a gauge field to the system so as to trigger topological transitions. For example, we can introduce a complex hopping coefficient between next-nearest neighbors in a honeycomb lattice which simulates the Haldane model. References:
[1] G. Jotzu, M. Messer, R. Desbuquois, M. Lebrat, T. Uehlinger, D. Greif, and T. Esslinger, Experimental realization of the topological Haldane model with ultracold fermions, Nature 515, 237-240 (2014). [2] A. Eckardt and E. Anisimovas, High-frequency approximation for periodically driven quantum systems from a Floquet-space perspective, New J. Phys. 093039 (2015). [3] M. Tarnowski, F. N. Ünal, N. Fläschner, B. S. Rem, A. Eckardt, K, Sengstock, and C. Weitenberg, Measuring topology from dynamics by obtaining the Chern number from a linking number, Nature Communications 10, 1728 (2019). [4] E. Arimondo, D. Ciampini, A. Eckardt, M. Holthaus, and O. Morsch, Kilohertz-driven Bose-Einstein condensates in optical lattices, Adv. At. Mol. Opt. Phy. 61, 515 (2012). [5] T. Zhou, Z. Yu, Z. Li, X. Chen, and X. Zhou, Simulation of nodal-line semimetal in amplitude-shaken optical lattices, Phys. Rev. A 102, 023328 (2020). |
Publications
[3] Y. Zhan, P. Hilaire, E. Barnes, S. Economou, and S. Sun, Performance analysis of all-optical quantum repeaters generated from a single quantum emitter, in preparation.
[2] Y. Zhan and S. Sun, Deterministic generation of loss-tolerant photonic cluster states with a single quantum emitter, Phys. Rev. Lett. 125, 223601 (2020), arXiv:2007.06608.
[1] L. Niu, X. Guo, Y. Zhan, X. Chen, W. M. Liu, and X. Zhou, Optimized fringe removal algorithm for absorption images, Appl. Phys. Lett. 113, 144103 (2018), arXiv:1809.10345.