It is known that the Kramers-Kronig (KK) relation between real and imaginary parts of the
optical susceptibility in the frequency domain can also be realized in the space domain, as …

Clock transitions play an important role in extending the coherence time of rare-earth (RE)
ion-doped crystals. It is still a challenge to accurately obtain the hyperfine structure of these …

We describe principles of operation of a quantum repeater, ie, a device designed to
distribute entangled states of quantum systems over long distances. A review is presented of …

Two-dimensional electronic spectroscopy (2DES) has high spectral resolution and is a
useful tool for studying atomic dynamics. In this paper, we show a smallest unit of …

The temperature dependencies of the spin–lattice relaxation time and the phase relaxation
time of 53 Cr 3+ ion in the Y 2 28 SiO 5 single crystal are measured at the anti-crossing point …

Quantum networks using photonic channels require control of the interactions between the
photons, carrying the information, and the elements comprising the nodes. In this work we …

Two-dimensional electronic spectroscopy (2DES) has high spectral resolution and is a
useful tool for studying atom dynamics. In this paper, we apply the electromagnetically …

Rare-earth spin ensembles are a promising platform for microwave quantum memory
applications due to their hyperfine transitions, which can exhibit exceptionally long …

Er $^{3+} $: Y $ _2 $ SiO $ _5 $ crystal is a promising candidate with a great variety of its
potential applications in quantum information processing and quantum communications …

Some of the results of this chapter are reported in our publications labeled as Paper IV,
submitted to npj Quantum information," Storage of photonic time bin qubits up to 20 ms in a …