Broadband waveguide quantum memory for entangled photons

Diffusion Properties of Tm3+ in Congruent LiNbO3 Crystal

“…This is the first finding that the rare‐earth doping can suppress the photorefractive effect. Third, as a memory medium, a Tm 3+ ‐doped Ti:LN waveguide can find its use in the field of quantum communication . In addition, a slightly Tm 3+ ‐doped (0.05 mol%) LN can be also used for data storage based on the nonvolatile two‐color holography .…”

“…The material preparation concentrates on the growth of bulk Tm 3+ ‐doped LN . As an alternative, the Tm 3+ ions can be incorporated by diffusion‐doping method . The merit of this method is that for the monolithic integration of active (optically pumped, rare‐earth‐doped) and passive (unpumped) devices on a same substrate, selective rare‐earth doping can avoid reabsorption in unpumped rare‐earth‐doped waveguide.…”

Microwave Rabi resonances beyond the small-signal regime

“…With the increasing use of 3D microwave cavities [24,25], including with atomic systems [9], atomic candle techniques can play an important role in calibrating the microwave field strengths for accurate measures of the coupling strength between the cavity field and, for instance, a microwave qubit [26][27][28]. These calibrations will be especially important for techniques that rely on precise timing, such as pulse-area-based quantum memories [29][30][31] and quantum transduction protocols [7,8,32,33].…”

Ultrabroadband quantum interface for telecom-wavelength single-photon qubits using a semiconductor quantum dot ensemble

“…So far, experimental demonstrations of transfer and retrieval of quantum states of single photons and entangled photons based on PE technique have been performed using an atomic ensemble in a rare-earth-ions doped solid [4,5]. However, the acceptable bandwidth was limited to 5 gigahertz at most due to the small inhomogeneous broadening [6]. A semiconductor quantum dot (QD) is the promising solidstate material for broadband quantum interface, since a QD ensemble exhibits the large inhomogeneous broadening of optical transition (exciton formation) of the order of 10 THz.…”