Processor for entangled complex signals
AssigneeGeneral Dynamics Advanced Information Systems, Inc.
InventorRichard Freeling
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Abstract
A system for and method of processing complex signals encoded into quantum states is presented. According to an embodiment of the invention, polarized components of a pump laser beam are separated and respectively modulated with first and second signals. The modulated polarized components are directed to adjacent non-linear crystals with optical axes aligned at right angles to each-other. Information regarding at least one of the first and second signals is then derived from measurements of coincidence events.
Claims26
An apparatus for processing complex signals, the apparatus comprising:
- a source of light;
- a polarizer in optical communication with the source of light, the polarizer configured to produce polarized light;
- a polarizing beam splitter in optical communication with the polarizer, the polarizing beam splitter configured to produce light having a first polarization and light having a second polarization, the first polarization being different from the second polarization;
- a first aperture configured to receive the light having the first polarization and produce first encoded light, the first encoded light being encoded with first information;
- a second aperture configured to receive the light having the second polarization and produce second encoded light, the second encoded light being encoded with second information;
- at least two adjacent nonlinear crystals configured to receive the first encoded light and the second encoded light, the two adjacent nonlinear crystals being separated by a distance;
- and
- a coincidence counter configured to detect coincidences between entangled photons, the entangled photons exiting the at least two adjacent nonlinear crystals.
A method for processing complex signals, the method comprising:
- generating polarized light;
- splitting the polarized light into a first polarized component spatially separated from a second polarized component, the first polarized component and the second polarized component collectively comprising first entangled photons;
- modulating the first polarized component with a first signal;
- modulating the second polarized component with a second signal;
- directing the first polarized component and the second polarized component through at least two adjacent nonlinear crystals to produce light comprising second entangled photons;
- performing a plurality of coincidence measurements on the light comprising second entangled photons;
- and
- determining, based on the plurality of coincidence measurements, at least one parameter associated with the first signal.
A method for processing complex signals comprising:
- providing light;
- imposing a first signal on a first polarized component of the light to produce first encoded light;
- imposing a second signal on a second polarized component of the light to produce second encoded light;
- transmitting the first encoded light and the second encoded light through adjacent nonlinear crystals separated by a distance;
- and
- determining a property of one of the first signal and the second signal using results of at least four coincidence measurements of entangled photons.
A method of encoding classical information as a quantum state, the method comprising:
- producing light;
- separating the light into a first polarized component and a second polarized component;
- modulating the first polarized component with a first classical signal to produce first modulated light;
- modulating the second polarized component with a second classical signal to produce second modulated light;
- and
- directing the first modulated light and the second modulated light through a first downconverter and a second downcon.
Dependencies are inferred from the claim text.