Silicon-based photonic quantum memory devices and methods for forming the same

A quantum memory device comprising:

• a bonded assembly of a first die and a second die,
• wherein the first die comprises:
• a waveguide configured to spatially confine paths of photons therein;
• a micro-ring resonator (MRR) comprising a first segment that is parallel to a segment of the waveguide;
• a frequency tuner configured to modulate a photon resonance frequency in the MRR by modifying an effective refractive index within, or around, a second segment of the MRR;
• and
• a quantum memory material portion including a quantum memory material having a ground state and an excitation state that stores photons therein and located within or on a third segment of the MRR;
• and
• wherein the second die comprises a control circuit configured to modulate a photon resonance wavelength in the MRR during a first step of a photon capture operation to match a predefined wavelength, and to generate captured photons in the MRR.

A quantum memory device comprising:

• a waveguide configured to spatially confine paths of photons therein;
• a memory cell that comprises a micro-ring resonator (MRR), a frequency tuner, and a quantum memory material portion, wherein the MRR comprises a first segment that is parallel to a segment of the waveguide, wherein the frequency tuner is configured to modulate a photon resonance frequency in the MRR by modifying an effective refractive index within, or around, a second segment of the MRR, and wherein the quantum memory material portion includes a quantum memory material having a ground state and an excitation state that stores photons therein and located within or on a third segment of the MRR;
• a control circuit configured to modulate the photon resonance wavelength in the MRR during a first step of a photon capture operation;
• and
• a magnetic field generator configured to generate a magnetic field in the third segment of the MRR and in the quantum memory material portion in a second step of the photon capture operation.