SILENT-INTERCEPTION DETECTION AND TRUST ESTABLISHMENT IN COMMUNICATION CHANNELS

1 . A method for secure quantum communication with silent-interception detection, comprising:

generating a plurality of photons;

encoding each photon across:

at least two quantum state dimensions selected from orbital angular momentum (OAM), polarization, and phase;

a spatial emission coordinate corresponding to a defined position on a structured geometry; and

a discrete temporal interval defined by a time-bin encoding scheme;

transmitting the encoded photons through a quantum communication channel;

receiving the transmitted photons at a receiver configured to measure:

quantum state characteristics,

spatial emission coordinates, and

temporal alignment relative to the time-bin encoding scheme;

computing, using a correlation engine, a composite interception score based on cross-dimensional disturbance metrics derived from deviations in the quantum state dimensions, spatial coordinates, and temporal intervals;

determining that a silent-interception condition exists when the composite interception score exceeds a predefined threshold without performing an active authentication challenge and without disclosing basis selection information; and

dynamically modifying at least one transmission parameter selected from spatial emission selection, time-bin allocation, or quantum state modulation in response to the silent-interception condition.

2 . The method of claim 1 , wherein the structured geometry comprises a double-helix configuration including a plurality of discrete emission points distributed along at least two helical chains.

3 . The method of claim 1 , wherein the time-bin encoding scheme comprises allocating photons into discrete time slots of predetermined duration and detecting temporal deviations exceeding a timing tolerance.

4 . The method of claim 1 , wherein the cross-dimensional disturbance metrics comprise at least one of: phase deviation, polarization drift, OAM mode shift, spatial coordinate anomaly, or temporal misalignment.

5 . The method of claim 1 , wherein computing the composite interception score comprises calculating a cross-dimensional correlation matrix between the disturbance metrics.

6 . The method of claim 1 , wherein determining the silent-interception condition is performed without publicly revealing encoding bases or raw key material.

7 . The method of claim 1 , wherein dynamically modifying the at least one transmission parameter comprises altering at least one of: emission point selection order, temporal emission sequencing, quantum modulation basis selection, or entanglement routing configuration.

8 . The method of claim 1 , wherein the encoded photons are used to generate a quantum key according to a quantum key distribution protocol.

9 . The method of claim 8 , wherein the quantum key distribution protocol comprises at least one of a BB84 protocol, an E91 protocol, a measurement device independent quantum key distribution (MDI-QKD) protocol, or a continuous-variable quantum key distribution (CV-QKD) protocol.

10 . A quantum communication system configured for silent-interception detection, comprising:

a photon source configured to generate photons;

a modulation subsystem configured to encode the photons across:

at least two quantum state dimensions,

a plurality of spatial emission points on a structured geometry, and

discrete time bins;

a receiver configured to measure quantum state properties, spatial emission positions, and temporal alignment;

a trust evaluation engine configured to compute a composite interception score based on cross-dimensional disturbance metrics; and

a reconfiguration controller configured to modify transmission parameters responsive to the composite interception score.

11 . The system of claim 10 , wherein the structured geometry comprises multiple parallel helix chains operating as separate quantum channels under a shared control module.

12 . The system of claim 10 , further comprising:

at least one intermediate node configured to perform entanglement distribution or Bell-state measurement; and

a trust aggregation module configured to compute a network-level integrity metric based on composite interception scores from multiple nodes.

13 . The system of claim 10 , wherein at least one encoding dimension comprises classical temporal or spatial encoding combined with quantum state encoding in a hybrid communication channel.

14 . The system of claim 10 , wherein the structured geometry is fabricated from a photonic-compatible material selected from the group consisting of silicon nitride, lithium niobate, fused silica, and glass.

15 . The system of claim 10 , wherein the modulation subsystem is configured to dynamically adjusts emission point selection according to a pseudorandom sequence synchronized between a sender and the receiver.

16 . The system of claim 10 , wherein the receiver includes a spatial decoding module, an orbital angular momentum (OAM) mode sorter, a polarization analyzer, and an interferometric phase detector.

17 . The system of claim 10 , wherein the at least two quantum state dimensions are selected from orbital angular momentum (OAM), polarization, and phase.

18 . A non-transitory computer-readable medium storing instructions that, when executed by a processor in a quantum communication system, cause the processor to perform or control performance of operations comprising:

computing cross-dimensional disturbance metrics across quantum state, spatial coordinate, and temporal interval dimensions;

generating a composite silent-interception score based on the cross-dimensional disturbance metrics; and

modifying quantum transmission parameters responsive to the composite silent-interception score without issuing an active authentication challenge.

19 . The non-transitory computer-readable medium of claim 18 , wherein the operations further comprise determining that a silent-interception condition exists when the composite silent-interception score exceeds a predefined threshold.

20 . The non-transitory computer-readable medium of claim 18 , wherein at least one of:

the cross-dimensional disturbance metrics comprise at least one of phase deviation, polarization drift, OAM mode shift, spatial coordinate anomaly, or temporal misalignment; or

modifying the quantum transmission parameters comprises at least one of altering spatial emission point selection, adjusting time-bin allocation, changing quantum state modulation parameters, or re-routing communication paths.