High-bandwidth photonic memory with a warm atomic vapor

A method for controlling a bandwidth of optical qubits retrieved from an atomic vapor storage, the method comprising:

• determining a target bandwidth for a retrieved optical qubit;
• preparing a control laser to retrieve a stored optical qubit from a hot atomic vapor system such that the retrieved optical qubit has the target bandwidth;
• transmitting the control laser through the hot atomic vapor system to modify transmission properties of the hot atomic vapor system;
• receiving the retrieved optical qubit form the hot atomic vapor system in response to the control laser;
• and
• isolating the retrieved optical qubit from the control laser.

A system for improving storage and retrieval of optical qubits stored in an atomic vapor, the system comprising:

• a hot atomic vapor system comprising an atomic vapor;
• a control laser configured to:
• transmit a first control pulse having a bandwidth that is based on a bandwidth of an optical qubit to modify transmission properties of the hot atomic vapor system;
• and
• transmit a second control pulse having properties based on a target bandwidth for a retrieved optical qubit;
• and
• an optical filtering system configured to isolate the retrieved optical qubit from the control laser, the optical filtering system comprising:
• a first etalon configured in a first double pass configuration, the first etalon having a first bandwidth;
• and
• a second etalon configured in a second double pass configuration, the second etalon being positioned to receive an output of the first etalon, and the second etalon having a second bandwidth, wherein the second bandwidth is different from the first bandwidth.