Publications

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2022
Tseng, Y-C, Wei W-C, Chen Y-C.  2022.  Efficient quantum memory for photonic polarization qubits generate by cavity-enhanced spontane-ous parametric downconversion. Opt. Express. 30, 19944(2022)
Wang, Y-S, Li K-B, Chang C-F, Lin T-W, Li J-Q, Hsiao S-S, Chen J-M, Lai Y-H, Chen Y-C, Chen Y-F, Chuu C-S, Yu IA.  2022.  Temporally ultralong biphotons with a linewidth of 50 kHz.. APL Photonics. 7(12), 126102(2022)
2021
Cheng, C-Y, Liu Z-Y, Hu P-S, Wang T-N, Chien C-Y, Shiu J-S, Yu IA, Chen Y-C, Chen Y-F.  2021.  Efficient frequency conversion based on electromagnetically induced transparency. Optics Letters. 46, 681(2021)
Hsu, C-Y, Wang Y-S, Chen J-M, Huang F-C, Ke Y-T, Huang EK, Hung W, Chao K-L, Hsaio S-S, Chen Y-H, Chuu C-S, Chen Y-C, Chen Y-F, Yu IA.  2021.  Generation of sub-MHz and spectrally-bright biphotons from hot atomic vapors with a phase mis-match-free scheme. Optics Express. 29, 4632(2021)
Chang, K-F, Wang T-P, Chen C-Y, Chen Y-H, Wang Y-S, Chen Y-F, Chen Y-C, Yu IA.  2021.  Low-loss, high-fidelity frequency beam splitter with tunable split ratio based on electromagnetical-ly induced transparency. Phys. Rev. Research. 3, 013096 (2021)
Kim, B, Chen K-T, Hsiao S-S, Wang S-Y, Li K-B, Ruseckas J, Juzeliūnas G, Kirova T, Auzinsh M, Chen Y-C, Chen Y-F, Yu IA.  2021.  A weakly-interacting many-body system of Rydberg polaritons based on electromagnetically in-duced transparency. Commun. Phys. 4:101(2021)
2020
Wei, Y-C, Hsiao Y-F, Wu B-H, Tsai P-J, Chen Y-C.  2020.  Broadband coherent optical memory based on electromagnetically induced transparency. Phys. Rev. A. 102, 063720Link
Tseng, Y-C, Wei Y-C, Chen Y-C.  2020.  Efficient quantum memory for heralded single photons generated by cavity-enhanced spontaneous parametric downconversion. arXiv. 2011.14948Link
Wei, Y-C, Lin S-X, Tsai P-J, Chen Y-C.  2020.  Memory-based optical polarization conversion in a double-Λ atomic system with degenerate Zeeman states. Sci Rep. 10, 13990 (2020) Link
Tsai, P-J, Wei Y-C, Wu B-H, Li S-X, Chen Y-C.  2020.  Theoretical study on memory-based optical converter with degenerate Zeeman states. Phys. Rev. A. 100(063843)Link
2019
Chang, K-F, Wang T-P, Chen C-Y, Chen Y-H, Wang Y-S, Chen Y-F, Chen Y-C, Yu IA.  2019.  Low-Loss High-Fidelity Frequency-Mode Hadamard Gates Based on Electromagnetically Induced Transparency. arXiv. 1907.03393
2016
Lee, C-Y, Wu B-H, Wang G, Chen Y-F, Chen Y-C, Yu IA.  2016.  High conversion efficiency in resonant four-wave mixing processes. Optics Express. 24 :1008-1016.
2013
Chen, YH, Lee MJ, Wang IC, Du SW, Chen YF, Chen YC, Yu IA.  2013.  Coherent Optical Memory with High Storage Efficiency and Large Fractional Delay, Feb. Physical Review Letters. 110:5., Number 8 AbstractWebsite

A high-storage efficiency and long-lived quantum memory for photons is an essential component in long-distance quantum communication and optical quantum computation. Here, we report a 78% storage efficiency of light pulses in a cold atomic medium based on the effect of electromagnetically induced transparency. At 50% storage efficiency, we obtain a fractional delay of 74, which is the best up-to-date record. The classical fidelity of the recalled pulse is better than 90% and nearly independent of the storage time, as confirmed by the direct measurement of phase evolution of the output light pulse with a beat-note interferometer. Such excellent phase coherence between the stored and recalled light pulses suggests that the current result may be readily applied to single photon wave packets. Our work significantly advances the technology of electromagnetically induced transparency-based optical memory and may find practical applications in long-distance quantum communication and optical quantum computation. DOI: 10.1103/PhysRevLett.110.083601

2012
Huang, SJ, Hsu YT, Lee H, Chen YC, Volosniev AG, Zinner NT, Wang DW.  2012.  Field-induced long-lived supermolecules, May 7. Physical Review A. 85 AbstractWebsite

We demonstrate that the long-lived bound states (supermolecules) can exist in the dilute limit when we tune the shape of the effective potential between polar molecules by an external microwave field. Binding energies, average sizes, and phase diagrams for both s-orbital (bosons) and p-orbital (fermions) dimers are studied, together with bosonic trimer states. We explicitly show that the nonadiabatic transition rate can be easily tuned small for such ground-state supermolecules, so that the system can be stable from collapse even near the associated potential resonance. Our results, therefore, suggest a feasible cold molecule system to investigate novel few-body and many-body physics (for example, the p-wave BCS-Bose-Einstein-condensate crossover for fermions and the paired condensate for bosons) that cannot be easily accessed in single species atomic gases.

Lin, C-C, Wu M-C, Shiau B-W, Chen Y-H, Yu IA, Chen Y-F, Chen Y-C.  2012.  Enhanced all-optical switching with double slow light pulses, Dec 28. Physical Review A. 86 AbstractWebsite
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2011
Shiau, BW, Wu MC, Lin CC, Chen YC.  2011.  Low-Light-Level Cross-Phase Modulation with Double Slow Light Pulses, May. Physical Review Letters. 106:4., Number 19 AbstractWebsite

We report on the first experimental demonstration of low-light-level cross-phase modulation (XPM) with double slow light pulses based on the double electromagnetically induced transparency (EIT) in cold cesium atoms. The double EIT is implemented with two control fields and two weak fields that drive populations prepared in the two doubly spin-polarized states. Group velocity matching can be obtained by tuning the intensity of either of the control fields. The XPM is based on the asymmetric M-type five-level system formed by the two sets of EIT. Enhancement in the XPM by group velocity matching is observed. Our work advances studies of low-light-level nonlinear optics based on double slow light pulses.

1994
Guan, WY, Xu YH, Sheen SR, Chen YC, Wei JYT, Lai HF, Wu MK, Ho JC.  1994.  ION-SIZE EFFECT ON TN IN (R1-XPRX)BA2CU3O7-Y SYSTEMS (R=LU, YB, TM, ER, Y, HO, DY, GD, EU, SM, AND ND), Jun 1. Physical Review B. 49:15993-15999. AbstractWebsite

We conducted a detailed study of the structure and magnetic properties of (R1-xPrx)Ba2Cu3O7 sintered samples, where R = Lu, Yb, Tm, Er, Y, Ho, Dy, Gd, Eu, Sm, and Nd for x = 0.5-1.0. We found that the temperature dependence of the dc susceptibility follows the Curie-Weiss law in the temperature range 20-300 K and the paramagnetism of the Pr and R sublattices exist independently of one another. The antiferromagnetic ordering temperature T(N) of Pr ions decreases monotonically with increasing R concentration (1-x). At a given x, T(N) is R-ion-size dependent. The slope in the T(N) vs x curve is steeper for ions with smaller ionic radii. The observed results are interpreted in terms of the hybridization between the local states of the Pr ion and the valence-band states of the CuO2 planes.

1993
Guan, WY, Chen YC, Wei JYT, Xu YH, Wu MK.  1993.  ION-SIZE EFFECT ON T(M) AND T(C) IN (R1-XPR(X))BA2CU3O7 SYSTEMS (R = YB, TM, ER, HO, DY, GD, EU, SM, ND AND Y), Apr. Physica C-Superconductivity and Its Applications. 209:19-22., Number 1-3 AbstractWebsite

The magnetic ordering temperatures T(m) of Pr ions in (R1-xPrx)Ba2Cu3O7 systems (R = Yb, Tm, Er, Ho, Dy, Gd, Eu, Sm, Nd and Y) with x = 0.5 - 1.0 were measured. We observe that T(m) decreases monotonically with increasing R concentration. At constant x, T(m) is R ion-size dependent. The slope in the T(m) vs. x is steeper for ion with smaller ionic radius. In comparison with the ion-size effect on the superconducting transition temperatures T(c) in these systems, the observed results can be qualitatively interpreted in terms of the hybridization between the local states of Pr ion and the conduction band states of the CuO2 planes.