# US 12,699,153 B2 · Method for signal suppression by increasing entropy and quantum algorithm > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 12,699,153 B2 - Document ID: US12699153B2 - Status: Granted - Kind: B2 - Application number: 18/781,211 - Filed: 2024-07-23 - Published: 2024-11-14 - Granted: 2026-08-04 - Earliest claimed: 2022-05-15 - Assignees: Foqus Technologies Inc. - Applicants: Foqus Technologies Inc. - Inventors: Sadegh Raeisi; Michele Mosca - Web page: https://patentgrep.com/patent/US12699153B2 ## CPC - G01R 33/0029: {Treating the measured signals, e.g. removing offset or noise} - H03K 19/195: using superconductive devices - G06N 5/01: Dynamic search techniques; Heuristics; Dynamic trees; Branch-and-bound - G06N 10/20: Models of quantum computing, e.g. quantum circuits or universal quantum computers - G06N 10/40: Physical realisations or architectures of quantum processors or components for manipulating qubits, e.g. qubit coupling or qubit control - G06N 10/70: Quantum error correction, detection or prevention, e.g. surface codes or magic state distillation - G01R 33/46: NMR spectroscopy - G01R 33/5607: {by reducing the NMR signal of a particular spin species, e.g. of a chemical species for fat suppression, or of a moving spin species for black-blood imaging} - G06N 7/01: Probabilistic graphical models, e.g. probabilistic networks - G01R: MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES (indicating correct tuning of resonant circuits H03J3/12) - H03K: PULSE TECHNIQUE (measuring pulse characteristics G01R; modulating sinusoidal oscillations with pulses H03C; transmission of digital information H04L; discriminator circuits detecting phase difference between two signals by counting or integrating cycles of oscillation H03D3/04; automatic control, starting, synchronisation or stabilisation of generators of electronic oscillations or pulses where the type of generator is irrelevant or unspecified H03L; coding, decoding or code conversion, in general H03M) - G06N: COMPUTING ARRANGEMENTS BASED ON SPECIFIC COMPUTATIONAL MODELS ## Abstract A method for signal suppression by increasing entropy in a system includes iteratively applying a set of electromagnetic (EM) pulses to the system, the set of EM pulses effecting swaps between the following pairs of system energy levels: a first system energy level in which the reset system is in a highest energy level and the target system is in a lowest target system energy level, and a corresponding second system energy level in which the reset system is in a highest energy level and the target system is in a highest target system energy level, and waiting a time period. This will suppress the signal of the target element. This for example can be a signal of a solvent in NMR. ## Claims ### Claim 1 A method for increasing entropy in a system, wherein the system comprises: a target system having one or more target elements, each target element having a first relaxation time, the target system further having a set of target system energy levels; and a reset system having one or more reset elements, each reset element having a second relaxation time that is shorter than the first relaxation time, the reset system further having a set of reset system energy levels; the full system having a set of system energy levels that includes all possible combinations of target system energy levels and the reset system energy levels, the method comprising: iteratively applying a set of EM pulses to the system to effect swaps between a) a first system energy level in which the reset system of the system is in a highest energy level of the set of reset system energy levels and the target system of the system is in a lowest target system energy level of the set of target system energy levels, and b) a corresponding second system energy level in which the reset system is in a highest energy level of the set of reset system energy levels and the target system is in a highest target system energy level of the set of target system energy levels; and waiting a time period that is on a order of the second relaxation time of a reset element and shorter than the first relaxation time of a target element, to facilitate at least some reset elements of the reset system resetting from the highest energy level. ### Claim 2 (depends on 1) The method of claim 1, wherein the target system comprises a plurality of target elements. ### Claim 3 (depends on 1) The method of claim 1, wherein the reset system comprises a plurality of reset elements. ### Claim 4 (depends on 1) The method of claim 1, wherein at least one target element is a spin. ### Claim 5 (depends on 4) The method of claim 4, wherein each target element is a multilevel quantum system. ### Claim 6 (depends on 5) The method of claim 5, wherein the multilevel quantum system is one of spin 1 particles and nitrogen vacancy (nv) centers. ### Claim 7 (depends on 1) The method of claim 1, wherein at least one reset element is a spin. ### Claim 8 (depends on 7) The method of claim 7, wherein each reset element is a multilevel quantum system. ### Claim 9 (depends on 8) The method of claim 8, wherein the multilevel quantum system is one of spin 1 particles and nitrogen vacancy (nv) centers. ### Claim 10 (depends on 1) The method of claim 1, wherein the target elements and the reset elements are spins. ### Claim 11 (depends on 10) The method of claim 10, wherein the target elements are comprised of a spin species different than the reset elements. ### Claim 12 (depends on 1) The method of claim 1, wherein one or both of the target elements and the reset elements are qubits. ### Claim 13 (depends on 1) The method of claim 1, wherein the set of EM pulses are applied to implement a sequence of quantum logic gates in order to effect swaps between the pairs of first quantum system energy levels and corresponding second quantum system energy levels. ### Claim 14 (depends on 13) The method of claim 13, wherein the quantum logic gates include a CNOT quantum gate with the reset element as a control. ### Claim 15 (depends on 1) The method of claim 1, wherein the second relaxation time is an effective relaxation time that is shorter than an intrinsic relaxation time of the reset elements. ### Claim 16 (depends on 1) The method of claim 1, wherein each iteration further comprises, during the waiting, manipulating the reset system to reduce the second relaxation time from the intrinsic relaxation time to the effective relaxation time. ### Claim 17 (depends on 16) The method of claim 16, wherein manipulating the reset system comprises performing one of optical polarization, optical pumping, and dynamic nuclear polarization. ### Claim 18 (depends on 1) The method of claim 1, wherein at least some of the pairs of first system energy levels and the corresponding second system energy levels correspond to one of entangled system states or non-diagonal system states. ### Claim 19 A non-transitory computer readable medium comprising computer executable instructions that, when executed, cause a computing device to increase entropy in a system, wherein the system comprises: a target system having one or more target elements, each target element having a first relaxation time, the target system further having a set of target system energy levels; and a reset system having one or more reset elements, each reset element having a second relaxation time that is shorter than the first relaxation time, the reset system further having a set of reset system energy levels; the full system having a set of system energy levels that includes all possible combinations of target system energy levels and the reset system energy levels, comprising computer-executable instructions for: iteratively applying a set of EM pulses to the system to effect swaps between a) a first system energy level in which the reset system of the system is in a highest energy level of the set of reset system energy levels and the target system of the system is in a lowest target system energy level of the set of target system energy levels, and b) a corresponding second system energy level in which the reset system is in a highest energy level of the set of reset system energy levels and the target system is in a highest target system energy level of the set of target system energy levels; and waiting a time period that is on a order of the second relaxation time of a reset element and shorter than the first relaxation time of a target element, to facilitate at least some reset elements of the reset system resetting from the highest energy level. ### Claim 20 A computing device comprising a processor and memory, the memory comprising computer executable instructions that, when executed by the processor, cause the device to increase entropy in a system, wherein the system comprises: a target system having one or more target elements, each target element having a first relaxation time, the target system further having a set of target system energy levels; and a reset system having one or more reset elements, each reset element having a second relaxation time that is shorter than the first relaxation time, the reset system further having a set of reset system energy levels; the full system having a set of system energy levels that includes all possible combinations of target system energy levels and the reset system energy levels, comprising computer-executable instructions for: iteratively applying a set of EM pulses to the system to effect swaps between a) a first system energy level in which the reset system of the system is in a highest energy level of the set of reset system energy levels and the target system of the system is in a lowest target system energy level of the set of target system energy levels, and b) a corresponding second system energy level in which the reset system is in a highest energy level of the set of reset system energy levels and the target system is in a highest target system energy level of the set of target system energy levels; and waiting a time period that is on a order of the second relaxation time of a reset element and shorter than the first relaxation time of a target element, to facilitate at least some reset elements of the reset system resetting from the highest energy level.