Entangled Quantum State Receiver

An entangled quantum state receiver comprising:

• a) an optical detector having an input that receives photons, the optical detector generating at an output an electrical signal having a signal characteristic in response to detection of a single photon;
• b) a first electrical circuit having an input electrically connected to the output of the optical detector, the first electrical circuit generating an electrical signal having a predetermined duration at an output when the signal characteristic is present at the input;
• c) a clock that generates a clock waveform with a period at an output;
• d) a second electrical circuit having an input electrically connected to the output of the first electrical circuit and an input electrically connected to the output of the clock, the second electrical circuit generating a state value when the electrical signal having the predetermined duration is present during a cycle of the clock waveform;
• and
• e) a processor coupled to the second electrical circuit and being configured to determine received entangled state information from the state value and configured to adjust the clock period based on a background photon count at the optical detector.

A method of receiving entangled quantum states, the method comprising:

• a) generating an electrical signal having a signal characteristic in response to detection of a single photon;
• b) generating an electrical signal having a predetermined duration in response to a detection of the presence of the signal characteristic;
• c) generating a clock waveform with a period;
• d) generating a state having a state value when the electrical signal having the predetermined duration is present during a cycle of the clock waveform;
• e) determining received entangled state information from the state value;
• and
• f) adjusting the clock period based on a background photon count.

An entangled quantum state receiver comprising:

• a) an optical detector having an input that receives photons, the optical detector generating at an output an electrical signal having a signal characteristic in response to detection of a single photon;
• b) a first electrical circuit having an input electrically connected to the output of the optical detector, the first electrical circuit generating an electrical signal having a predetermined duration at an output when the signal characteristic is present at the input;
• c) a clock that generates a clock waveform with a period at an output;
• d) a second electrical circuit having an input electrically connected to the output of the first electrical circuit and an input electrically connected to the output of the clock, the second electrical circuit generating a state value when the electrical signal having the predetermined duration is present during a cycle of the clock waveform;
• and
• e) a processor coupled to the second electrical circuit and being configured to determine received entangled state information from the state value and configured to adjust the predetermined duration based on a background photon count at the optical detector.