Raman quantum memory based on an ensemble of silicon-vacancy centers in diamond

Abstract

The possibility of implementing a cavity-enhanced off-resonant Raman quantum memory in an ensemble of silicon-vacancy centers in diamond is studied. It is shown that the signal-tonoise ratio at the output of the memory can significantly exceed unity for short single-photon pulses if the number of optical centers is small enough, which can be achieved with diamond samples in optical microresonators, and level splitting in their ground state is significantly enhanced by strain.

Quantum memory based on SiV-centers in nanodiamonds

“…Let us consider quantum memory based on the Raman interaction of two fields with an ensemble of SiV-centers placed in a resonator, as was suggested in [13], but now the color centers are assumed to be placed in a diamond nanoparticle (see figure 1(a)). The latter is in weak mechanical contact with a substrate, which may be cooled by contact with a liquid helium bath.…”

“…Recently, a theoretical model was developed that describes the storage and recall of weak light pulses via off-resonant Raman absorption and emission of photons in an ensemble of SiV-centers, where orbital transition between the branches of the ground state is used for storage [13]. Numerical results have shown that the signal-to-noise ratio can significantly exceed unity for short single-photon input pulses if the level splitting in their ground state is significantly enhanced by deformation.…”

Optical parametric oscillator with quantum memory for quantum repeaters

“…In this case 2d ≪ 1 and 2κ at = 2dc/L. Regarding off-resonant Raman interaction of the atomic ensemble with the created signal field, in addition to the simplest pulsed protocol [31][32][33], we can take advantage of quantum storage with controlled inhomogeneous broadening of the storage transition [34][35][36][37][38][39]. The latter provides storage and retrieval of single photons in a series, which greatly enhance the distribution rate of entanglement via temporal multiplexing.…”

Studying the effect of fluctuating environment on intra-atomic frequency comb based quantum memory

“…Along with probabilistic single-photon sources, it can also be used to achieve deterministic single-photon sources 4 , 5 . Among the atomic ensemble based quantum memories electromagnetically induced transparency 6 – 12 , controlled reversible inhomogeneous broadening 13 – 18 , gradient echo memory 19 – 22 , Raman quantum memory 23 – 26 and the atomic frequency combs (AFCs) 27 – 33 are the most prevalent protocols for photonic quantum memory. The basic idea behind an atomic ensemble based quantum memory is the controlled reversible transfer of information between the light field and the atomic states.…”