Quantum-state readout using four-wave mixing
AssigneeColdQuanta, Inc.
InventorAlexander Georgiyevich Radnaev
Life of this patent
Estimating the term…
Abstract
Quantum state readout is achieved using four-wave mixing. A quantum-state carrier, e.g., a cesium 133 atom, is illuminated with a set of three wavelengths. In the event that the atom is in a first quantum state, e.g., an F=3 state of cesium 133, the illumination triggers emission in a first direction from the atom of a fourth wavelength due to four-wave mixing. Detection of the emission in the first direction thus indicates that the atom is in the first quantum state. In an embodiment, failure to detect an emission indicates the atom is in a second quantum state. In other embodiments, a second set of three wavelengths is used to provide a positive indication that the atom is in its second state, e.g., an F=4 state for cesium 133.
Claims16
A quantum-state readout system comprising:
- a laser system for illuminating a quantum-state carrier (QSC) with electromagnetic radiation (EMR) including at least one illumination set of at least three different wavelengths configured to cause the QSC to emit EMR of an emissions wavelength via four-wave mixing while the QSC is illuminated by the at least one illumination set, wherein the at least one illumination set comprises a first illumination set including the at least three different wavelengths, and a second illumination set including a plurality of additional wavelengths configured to cause the QSC to emit EMR of a second emissions wavelength via four-wave mixing while the QSC is illuminated by the second illumination set;
- a photodetector system configured to:
- generate a first emission determination indicating whether or not EMR of the emissions wavelength, different from each of the at least three different wavelengths of the at least one illumination set, has been detected;
- and
- generate a second emission determination indicating whether or not EMR of the second emissions wavelength has been detected;
- and
- a readout processor for identifying a quantum state of the QSC based on the emission determination configured to:
- determine that the QSC was in a first quantum state when the first emission determination indicates that EMR of the emissions wavelength has been detected;
- and
- determine that the QSC was in a second quantum state when the second emission determination indicates that EMR of the second emissions wavelength has been detected.
A method comprising:
- illuminating, using a laser system, a quantum-state carrier (QSC) with electromagnetic radiation (EMR) including at least one illumination set of at least three different wavelengths configured to cause the QSC to emit EMR of an emissions wavelength via four-wave mixing while the QSC is illuminated by the at least one illumination set, wherein the at least one illumination set comprises a first illumination set including the at least three different wavelengths, and a second illumination set including a plurality of additional wavelengths configured to cause the QSC to emit EMR of a second emissions wavelength via four-wave mixing while the QSC is illuminated by the second illumination set;
- generating, using a photodetector system, a first emission determination indicating whether or not EMR of the emissions wavelength, different from each of the at least three different wavelengths of the at least one illumination set, has been detected;
- and
- generating, using the photodetector system, a second emission determination indicating whether or not EMR of the second emissions wavelength has been detected;
- and
- determining, using a readout processor, that the QSC was in a first quantum state when the first emission determination indicates that EMR of the emissions wavelength has been detected;
- and
- determining, using the readout processor, that the QSC was in a second quantum state when the second emission determination indicates that EMR of the second emissions wavelength has been detected.
Dependencies are inferred from the claim text.