System and method of detecting entangled photons

A method of detecting entangled-photon pairs configured to have a predetermined quantum state relationship with a prepared target medium, each entangled-photon pair comprising a signal photon and an idler photon, the method comprising:

• supplying a target medium;
• configuring a quantum state of the target medium relative to the entangled-photon pairs thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled two-photon cross-section for the entangled-photon pairs and decrease a random two-photon absorption cross-section for the entangled-photon pairs;
• receiving entangled-photon pairs, at least a portion of the entangled-photon pairs configured to have at least one of:
• an entanglement time to substantially maximize an associated entangled photon cross-section of the prepared target medium, and an entanglement area to substantially maximize an associated entangled photon cross-section of the prepared target medium;
• the entangled photon pairs having an energy distribution among the signal photon and the idler photon in each pair to substantially minimize an associated random two-photon absorption cross-section of the prepared target medium;
• detecting at least one entangled-photon pair being absorbed by the prepared target medium;
• and
• outputting an electrical signal representing said detecting.

A method of providing entangled-photon pairs configured to have a large entangled-photon pair cross section and a small random photon pair cross section relative to a prepared target medium, the method comprising:

• supplying a target medium;
• configuring a quantum state of the target medium relative to the entangled-photon pairs thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled two-photon cross-section for the entangled-photon pairs and decrease a random two-photon absorption cross-section for the entangled-photon pairs;
• providing entangled photon pairs having at least one of an entanglement time to substantially maximize an associated entangled photon cross-section for the prepared target medium, and an entanglement area to substantially maximize an associated entangled photon cross-section for the prepared target medium;
• selecting entangled-photon pairs having an energy distribution among a signal photon and an idler photon to substantially minimize an associated random photon pair absorption cross section of the prepared target medium;
• and
• sending the entangled photons to a receiver, the receiver configured to cause at least a portion of the entangled photons to come into contact with the prepared target medium.

A method of detecting entangled photons, the entangled photons configured to have a predetermined quantum relationship with a prepared target medium, the method comprising:

• supplying a target medium;
• configuring a quantum state of the target medium relative to the entangled photons thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled multi-photon cross-section for the entangled-photon pairs and decrease a random multi-photon absorption cross-section for the entangled photons;
• producing entangled photons tailored for entangled photon absorption by the prepared target medium;
• conditioning the entangled photons to reduce random multi-photon absorption by the target medium;
• directing the entangled photons to the prepared target medium;
• detecting at least one entangled-photon absorption by the prepared target medium;
• and
• outputting an electrical signal representing said detecting.

A method of providing entangled photons configured to have a high entangled-photon absorption and low random multi-photon absorption for a corresponding predetermined and prepared target medium, the method comprising:

• supplying a target medium
• configuring a quantum state of the target medium relative to the entangled photons thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• producing entangled photons tailored for entangled photon absorption by the prepared target medium;
• conditioning the entangled photons to reduce random multi-photon absorption by the prepared target medium;
• sending the entangled photons to a receiver, the receiver configured to cause at least a portion of the entangled photons to come into contact with the prepared target medium.

A method of detecting entangled photons configured to have a predetermined quantum state relationship with a prepared target medium, the method comprising:

• supplying a target medium;
• configuring a quantum state of the target medium relative to the entangled photons thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• receiving entangled photons, the entangled photons being tailored for entangled-photon absorption by the prepared target medium, the entangled photons being conditioned to reduce random multi-photon absorption by the prepared target medium;
• causing the entangled photons to come into contact with the prepared target medium;
• detecting at least one entangled-photon absorption by the prepared target medium;
• and
• outputting an electrical signal representing said detecting.

A system for detecting entangled photons configured to have a predetermined quantum state relationship with a prepared target medium, the system comprising:

• a prepared target medium configured to have a quantum state to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• an entangled photon source configured to produce entangled photons tailored for entangled-photon absorption by the prepared target medium;
• a screen configured to pass entangled photons having an energy distribution selected to reduce random multi-photon absorption by the prepared target medium;
• and
• a sensor configured to detect entangled-photon absorption by the prepared target medium.

A system for producing entangled photons having high entangled-photon absorption and low random multi-photon absorption for a prepared target medium, the prepared target medium configured to have a predetermined quantum relationship with the entangled photons, the system comprising:

• a prepared target medium having a predetermined quantum state relative to the entangled photons, wherein the prepared target medium has a quantum state configured to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• an entangled photon source configured for producing entangled photons tailored for entangled-photon absorption by the prepared target medium;
• and
• a screen configured to pass entangled-photon pairs having an energy distribution selected to reduce random photon absorption by the prepared target medium.

A method of detecting entangled photons configured to have a predetermined relationship with a prepared target medium, the method comprising:

• supplying a target medium;
• configuring a quantum state of the target medium relative to the entangled photons thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• producing entangled photons having properties for entangled-photon absorption by the prepared target medium;
• preparing the entangled photons to reduce random photon absorption by the prepared target medium;
• directing the entangled photons to the prepared target medium;
• detecting at least one entangled-photon absorption by the prepared target medium;
• and
• outputting an electrical signal representing said detecting.

A method of providing entangled photons having a high entangled-photon absorption rate for a prepared target medium, the entangled photons configured to have a predetermined quantum state relationship with the prepared target medium, the method comprising:

• supplying a target medium;
• configuring a quantum state of the target medium relative to the entangled photons thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• producing entangled photons having properties for entangled-photon absorption the prepared target medium;
• preparing the entangled photons to reduce random photon absorption by the prepared target medium;
• and
• sending the entangled photons to a receiver, the receiver configured to cause at least a portion of the entangled photons to come into contact with the prepared target medium.

A method of detecting entangled photons using a prepared target medium, the entangled photons configured to have a predetermined quantum state relationship with the prepared target medium, the method comprising:

• supplying a target medium;
• configuring a quantum state of the target medium relative to the entangled photons thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• receiving entangled photons, the entangled photons having properties for entangled-photon absorption by the prepared target medium;
• preparing the entangled photons to reduce random photon absorption by the prepared target medium;
• causing the entangled photons to come into contact with the prepared target medium;
• detecting at least one entangled-photon absorption by the prepared target medium;
• and
• outputting an electrical signal representing said detecting.

A system for detecting entangled photons using a prepared target medium, the entangled photons configured to have a predetermined quantum state relationship with the prepared target medium the method comprising:

• supplying a target medium;
• configuring a quantum state of the target medium relative to the entangled photons thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• an entangled photon source configured to produce entangled photons having properties for entangled-photon absorption by the prepared target medium;
• a screen configured to pass entangled photon having an energy distribution selected to reduce random photon absorption by the prepared target medium;
• and
• a sensor configured to detect entangled-photon absorption by the prepared target medium.

A system for producing entangled photons having high entangled-photon absorption using a prepared target medium, the entangled photons configured to have a predetermined quantum state relationship with the prepared target medium, the method, the system comprising:

• supplying a target medium;
• configuring a quantum state of the target medium relative to the entangled photons thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• an entangled photons source configured for producing entangled photons having properties for entangled-photon absorption by the prepared target medium;
• and
• a screen configured to pass entangled photons having an energy distribution selected to reduce random photon absorption by the prepared target medium.

A system for detecting entangled photons using a prepared target medium, the entangled photons configured to have a predetermined quantum state relationship with the prepared target medium, the system comprising:

• a prepared target medium configured to have a quantum state to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• a screen configured to select entangled photons having reduced random photon absorption by the prepared target medium;
• and
• a sensor configured to detect entangled photon absorption by the prepared target medium.

A system for detecting entangled photons using a prepared target medium, the entangled photons configured to have a predetermined quantum state relationship with the prepared target medium, the system comprising:

• means for configuring a quantum state of a target medium relative to the entangled photons thereby producing the prepared target medium, wherein the prepared target medium has a quantum state configured to substantially increase an entangled photon cross-section for the entangled photons and decrease a random multi-photon absorption cross-section for the entangled photons;
• means for producing entangled photons having properties for entangled-photon absorption by the prepared target medium;
• means for selecting entangled photons having reduced probability of random photon absorption by the prepared target medium;
• means for to absorbing entangled photons having properties suitable for entangled-photon absorption by the prepared target medium;
• and
• means for detecting entangled photon absorption by the target medium.