Long optical storage times are an essential requirement to establish high-rate entanglement distribution over large distances using memory-based quantum repeaters. Rare earth ion-doped crystals are arguably well-suited candidates for building such quantum memories. Toward this end, we investigate the 795.32 nm 3H6 ↔ 3H4 transition of 1% thulium-doped yttrium gallium garnet crystal (Tm3+:Y3Ga5O12 : Tm3+:YGG). Most essentially, we find that the optical coherence time can reach 1.1 ms, and, using laser pulses, we demonstrate optical storage based on the atomic frequency comb (AFC) protocol up to 100 µs. In addition, we demonstrate multiplexed storage, including feed-forward selection, shifting, and filtering of spectral modes, as well as quantum state storage using members of non-classical photon pairs. Our results show that Tm:YGG can be a potential candidate for creating multiplexed quantum memories with long optical storage times.
Future quantum networks will allow the secure distribution of encryption keys over extended distances, blind quantum computing, and networked quantum computers and atomic clocks. I will discuss our experimental work on two key ingredients of such networks: a solid-state storage device for quantum states of light, and a detector that promises detecting the presence of photons without destroying them. Both devices employ a Thulium-doped LiNbO3 crystal cooled to a temperature of around 1K.
We experimentally investigate a highly integrated, polarization qubit based quantum key distribution system
over a real-world, 12.4 km fiber link. Our system implements quantum frames, i.e. alternating sequences of
high intensity optical pulses (classical data) and faint ones (qubits or quantum data). The classical data enables
compensation of time-varying birefringence in the fiber link, and will facilitate synchronization, time tagging,
and allow extending point-to-point quantum key distribution systems to networks. Our system can be clocked
at 980 MHz, and has demonstrated good stability over 37 hours operation. We also discuss high rate error
correction using a low-density parity-check code.
A recently proposed, photon echo related approach to quantum state storage in atomic ensembles employs
controlled reversible inhomogeneous broadening (CRIB). Beyond storage, a modified version of CRIB promises
controlled quantum state manipulations. As the implementation of CRIB is currently still challenging, we
investigate state transformation based on stimulated photon echoes. Specifically, we show how to translate an all
optical, beamsplitter based setup into a photon echo based setup, and we simulate a photon echo based POVM
(positive operator valued measure) measurement using Maxwell-Bloch equations.
In this paper we propose various applications of guided wave optics to quantum optics experiments. As quantum optics moves on to multiparticle and multiport configurations, guided wave optics, incorporating both integrated optics and fiber optics, could provide a realistic means of constructing experiments and devices.
Conference Committee Involvement (7)
Quantum Nanophotonic Materials, Devices, and Systems 2023
23 August 2023 | San Diego, California, United States
Quantum Nanophotonic Materials, Devices, and Systems 2022
22 August 2022 | San Diego, California, United States
Quantum Nanophotonic Materials, Devices, and Systems 2021
2 August 2021 | San Diego, California, United States
Quantum Nanophotonic Materials, Devices, and Systems 2020
24 August 2020 | Online Only, California, United States
Quantum Nanophotonic Materials, Devices, and Systems 2019
14 August 2019 | San Diego, California, United States
Quantum Photonic Devices 2018
19 August 2018 | San Diego, California, United States
Quantum Photonic Devices
6 August 2017 | San Diego, California, United States
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