2 research outputs found
Development of a Boston-area 50-km fiber quantum network testbed
Distributing quantum information between remote systems will necessitate the
integration of emerging quantum components with existing communication
infrastructure. This requires understanding the channel-induced degradations of
the transmitted quantum signals, beyond the typical characterization methods
for classical communication systems. Here we report on a comprehensive
characterization of a Boston-Area Quantum Network (BARQNET) telecom fiber
testbed, measuring the time-of-flight, polarization, and phase noise imparted
on transmitted signals. We further design and demonstrate a compensation system
that is both resilient to these noise sources and compatible with integration
of emerging quantum memory components on the deployed link. These results have
utility for future work on the BARQNET as well as other quantum network
testbeds in development, enabling near-term quantum networking demonstrations
and informing what areas of technology development will be most impactful in
advancing future system capabilities.Comment: 9 pages, 5 figures + Supplemental Material
Telecom networking with a diamond quantum memory
Practical quantum networks require interfacing quantum memories with existing
channels and systems that operate in the telecom band. Here we demonstrate
low-noise, bidirectional quantum frequency conversion that enables a
solid-state quantum memory to directly interface with telecom-band systems. In
particular, we demonstrate conversion of visible-band single photons emitted
from a silicon-vacancy (SiV) center in diamond to the telecom O-band,
maintaining low noise () and high indistinguishability
(). We further demonstrate the utility of this system for quantum
networking by converting telecom-band time-bin pulses, sent across a lossy and
noisy 50 km deployed fiber link, to the visible band and mapping their quantum
states onto a diamond quantum memory with fidelity .
These results demonstrate the viability of SiV quantum memories integrated with
telecom-band systems for scalable quantum networking applications.Comment: 9 pages, 5 figures + Supplemental Material