Atom phase-controlled double rephasing-based quantum memory and double-rephased photon echo method therefor
AssigneesInha-Industry Partnership Institute, Gwangju Institute of Science and Technology
InventorByoung Seung Ham
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Abstract
Disclosed herein are atom phase-controlled double rephasing-based quantum memory and a double-rephased photon echo method therefor. The atom phase-controlled double rephasing-based quantum memory includes an optical medium and an optical pulse generation unit. The optical medium has three energy levels (|1>, |2> and |3>), receives one or more optical pulses from an optical pulse generation unit, and generates output light that satisfies phase matching conditions. The optical pulse generation unit generates at least five optical pulses that resonate among the energy levels of the optical medium.
Claims10
Atom phase-controlled double rephasing-based quantum memory, the memory comprising:
- an optical medium having three energy levels including first energy level (|1>), second energy level (|2>), and third energy level (|3>), and configured to
- receive one or more optical pulses from an optical pulse generation unit, and
- generate output light that satisfies phase matching conditions;
- and
- the optical pulse generation unit configured to generate at least five optical pulses that resonate among the energy levels of the optical medium,
- wherein the optical medium is further configured to
- generate the output light having π phase shift by using first and second phase control pulses having π-pulse,
- shift the π phase shift of the output light into 2π phase shift by using a rephasing pulse 1 providing phase gain π, and
- generate final output light having emission characteristic by shifting the 2π phase shift of the output light to 3π phase shift by using a rephasing pulse 2 providing phase gain π.
A double rephased photon echo method for atom phase-controlled double rephasing-based quantum memory, the method comprising:
- causing input light to enter an optical medium and generate a phase grating in accordance with optical coherence;
- causing rephasing pulse 1 to enter the optical medium and reverse phase evolution of the phase grating;
- causing a first phase control pulse to enter the optical medium and replace the phase grating with a spin phase grating in accordance of spin coherence;
- causing a second phase control pulse to enter the optical medium and restore the spin coherence to the optical coherence;
- generating output light as a silence echo;
- and
- generating final output light as an inversion-free echo using rephasing pulse 2,
- wherein the output light have 2π phase shift and absorption characteristic according to the first and second phase control pulses having π-pulse and the rephasing pulse 1 providing phase gain π, and
- wherein the final output light have emission characteristic according to the rephasing pulse 2 providing phase gain π.
Dependencies are inferred from the claim text.