TY  - JOUR
A1  - Lee, Chang-Min
A1  - Lim, Hee-Jin
A1  - Schneider, Christian
A1  - Maier, Sebastian
A1  - Höfling, Sven
A1  - Kamp, Martin
A1  - Lee, Yong-Hee
T1  - Efficient single photon source based on \(\mu\)-fibre-coupled tunable microcavity
JF  - Scientific Reports
N2  - Efficient and fast on-demand single photon sources have been sought after as critical components of quantum information science. We report an efficient and tunable single photon source based on an InAs quantum dot (QD) embedded in a photonic crystal cavity coupled with a highly curved \(\mu\)-fibre. Exploiting evanescent coupling between the \(\mu\)-fibre and the cavity, a high collection efficiency of 23% and Purcell-enhanced spontaneous emissions are observed. In our scheme, the spectral position of a resonance can be tuned by as much as 1.5 nm by adjusting the contact position of the \(\mu\)-fibre, which increases the spectral coupling probability between the QD and the cavity mode. Taking advantage of the high photon count rate and the tunability, the collection efficiencies and the decay rates are systematically investigated as a function of the QD-cavity detuning.
KW  - tapers
KW  - semiconductor quantum dots
KW  - crystal
KW  - nanowire
KW  - generation
KW  - nanoactivity
KW  - mode
KW  - emission
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-145835
VL  - 5
IS  - 14309
ER  - 
TY  - JOUR
A1  - Schatton, Tobias
A1  - Yang, Jun
A1  - Kleffel, Sonja
A1  - Uehara, Mayuko
A1  - Barthel, Steven R.
A1  - Schlapbach, Christoph
A1  - Zhan, Qian
A1  - Dudeney, Stephen
A1  - Mueller, Hansgeorg
A1  - Lee, Nayoung
A1  - de Vries, Juliane C.
A1  - Meier, Barbara
A1  - Beken, Seppe Vander
A1  - Kluth, Mark A.
A1  - Ganss, Christoph
A1  - Sharpe, Arlene H.
A1  - Waaga-Gasser, Ana Maria
A1  - Sayegh, Mohamed H.
A1  - Abdi, Reza
A1  - Scharffetter-Kochanek, Karin
A1  - Murphy, George F.
A1  - Kupper, Thomas S.
A1  - Frank, Natasha Y.
A1  - Frank, Markus H.
T1  - ABCB5 Identifies Immunoregulatory Dermal Cells
JF  - Cell Reports
N2  - Cell-based strategies represent a new frontier in the treatment of immune-mediated disorders. However, the paucity of markers for isolation of molecularly defined immunomodulatory cell populations poses a barrier to this field. Here, we show that ATP-binding cassette member B5 (ABCB5) identifies dermal immunoregulatory cells (DIRCs) capable of exerting therapeutic immunoregulatory functions through engagement of programmed cell death 1 (PD-1). Purified Abcb5\(^+\) DIRCs suppressed T cell proliferation, evaded immune rejection, homed to recipient immune tissues, and induced Tregs in vivo. In fully major-histocompatibility-complex-mismatched cardiac allotransplantation models, allogeneic DIRCs significantly prolonged allograft survival. Blockade of DIRC-expressed PD-1 reversed the inhibitory effects of DIRCs on T cell activation, inhibited DIRC-dependent Treg induction, and attenuated DIRC-induced prolongation of cardiac allograft survival, indicating that DIRC immunoregulatory function is mediated, at least in part, through PD-1. Our results identify ABCB5\(^+\) DIRCs as a distinct immunoregulatory cell population and suggest promising roles of this expandable cell subset in cellular immunotherapy.
KW  - mesenchymal stem cells
KW  - P-glycoprotein
KW  - regulatory T cells
KW  - maintain immune homeostasis
KW  - malignant melanoma
KW  - in vivo
KW  - skin
KW  - generation
KW  - transplant
KW  - tolerance
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-149989
VL  - 12
SP  - 1564
EP  - 1574
ER  - 
TY  - JOUR
A1  - Yu, Leo
A1  - Natarajan, Chandra M.
A1  - Horikiri, Tomoyuki
A1  - Langrock, Carsten
A1  - Pelc, Jason S.
A1  - Tanner, Michael G.
A1  - Abe, Eisuke
A1  - Maier, Sebastian
A1  - Schneider, Christian
A1  - Höfling, Sven
A1  - Kamp, Martin
A1  - Hadfield, Robert H.
A1  - Fejer, Martin M.
A1  - Yamamoto, Yoshihisa
T1  - Two-photon interference at telecom wavelengths for time-bin-encoded single photons from quantum-dot spin qubits
JF  - Nature Communications
N2  - Practical quantum communication between remote quantum memories rely on single photons at telecom wavelengths. Although spin-photon entanglement has been demonstrated in atomic and solid-state qubit systems, the produced single photons at short wavelengths and with polarization encoding are not suitable for long-distance communication, because they suffer from high propagation loss and depolarization in optical fibres. Establishing entanglement between remote quantum nodes would further require the photons generated from separate nodes to be indistinguishable. Here, we report the observation of correlations between a quantum-dot spin and a telecom single photon across a 2-km fibre channel based on time-bin encoding and background-free frequency downconversion. The downconverted photon at telecom wavelengths exhibits two-photon interference with another photon from an independent source, achieving a mean wavepacket overlap of greater than 0.89 despite their original wavelength mismatch (900 and 911 nm). The quantum-networking operations that we demonstrate will enable practical communication between solid-state spin qubits across long distances.
KW  - atom
KW  - 1550 nm
KW  - up-conversion
KW  - heralded entanglement
KW  - emission
KW  - interface
KW  - generation
KW  - communication
KW  - downconversion
Y1  - 2015
U6  - http://nbn-resolving.de/urn/resolver.pl?urn:nbn:de:bvb:20-opus-138677
VL  - 6
ER  -