Method of privately sharing correlated state information on demand

Inventors: Gary Vacon (East Falmouth, MA); Kristin A. Rauschenbach (Franconia, NH)

Assignee: Qubit Moving and Storage, LLC

G06N10/20 G06F12/122 G06F2212/1004

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Quick Facts

Patent No.: US 12705518
App. No.: 18/959,122
Granted: Aug 11, 2026
Kind: B2

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Abstract

A method of privately sharing correlated state information on demand includes sharing a pair of entangled qubits between two nodes that are connected by a communication channel, wherein one qubit of the pair of entangled qubits is received by one of the two nodes and the other qubit of the pair of entangled qubits is received by the other of the two nodes. The one qubit of the pair of entangled qubits that is received by the one of the two nodes is stored in a quantum cache. Entanglement and coherence of the stored one qubit of the pair of entangled qubits is maintained in the quantum cache for subsequent unloading of the stored one qubit of the pair of entangled qubits, such that the unloaded stored one qubit of the pair of entangled qubits is coherent. A manipulation by a third party of the pair of entangled qubits is detected using a quantum key distribution protocol, thereby ensuring privacy of shared correlated state information from eavesdroppers. Classical data comprising classical information that is tagged to a particular qubit is stored, such that the one qubit of the pair of entangled qubits has associated classical information that is tagged to the one qubit of the pair of entangled qubits. The stored one qubit of the pair of entangled qubits is unloaded at a desired time that is based on the stored associated classical information that is tagged to the one qubit of the pair of entangled qubits. The unloaded stored one qubit of the pair of entangled qubits is measured. The shared correlated state information that is private from eavesdroppers based on the measurement is generated.

Claims (37)

1 . A method of privately sharing correlated state information on demand, the method comprising:

a) sharing a pair of entangled qubits between two nodes that are connected by a communication channel, wherein one qubit of the pair of entangled qubits is received by one of the two nodes and the other qubit of the pair of entangled qubits is received by the other of the two nodes;

b) storing the one qubit of the pair of entangled qubits that is received by the one of the two nodes in a quantum cache;

c) maintaining entanglement and coherence of the stored one qubit of the pair of entangled qubits in the quantum cache for subsequent provisioning of the stored one qubit of the pair of entangled qubits to an application;

d) detecting a manipulation by a third party of the pair of entangled qubits using a quantum key distribution protocol, thereby ensuring privacy of shared correlated state information from eavesdroppers;

e) storing classical data in a classical store, the classical data comprising an index that associates particular items of classical data with particular entangled qubits, such that the one qubit of the pair of entangled qubits has a first associated index and the other qubit of the pair of entangled qubits has a second associated index;

f) providing the stored classical data comprising the index to the application;

g) unloading the stored one qubit of the pair of entangled qubits to the application at a particular time that is based on the provided stored classical data comprising the index such that the application accesses the stored one qubit of the pair of entangled qubits on demand;

h) measuring the unloaded stored one qubit of the pair of entangled qubits; and

i) generating the shared correlated state information that is private from eavesdroppers based on the measurement.

2 . The method of claim 1 , wherein the shared correlated state information comprises a shared random number.

3 . The method of claim 1 , wherein the shared correlated state information comprises an address.

4 . The method of claim 1 , further comprising determining a fidelity of coherence of qubits in the quantum cache.

5 . The method of claim 4 , further comprising removing qubits from the quantum cache based on the determined fidelity.

6 . The method of claim 1 , wherein the storing the one qubit of the pair of entangled qubits that is received by the one of the two nodes in the quantum cache comprises storing in an optical fiber loop.

7 . The method of claim 1 , wherein the storing the one qubit of the pair of entangled qubits that is received by the one of the two nodes in the quantum cache comprises storing in a first-in-first-out (FIFO) cache.

8 . The method of claim 1 , wherein the storing the one qubit of the pair of entangled qubits that is received by the one of the two nodes in the quantum cache comprises storing in a last-in-first-out (LIFO) cache.

9 . The method of claim 1 , wherein the storing the one qubit of the pair of entangled qubits that is received by the one of the two nodes in the quantum cache comprises storing in a random access cache.

10 . The method of claim 1 , wherein the first associated index of the one qubit of the pair of entangled qubits indicates which other node's quantum qubit it is entangled with.

11 . The method of claim 1 , further comprising sending application commands from the application to the quantum cache to control the quantum cache.

12 . The method of claim 11 , wherein the application command comprises a cache_pointer.

13 . The method of claim 11 , wherein the application command comprises a qubit_pointer.

14 . A method of privately sharing correlated state information on demand, the method comprising:

b) storing the one qubit of the pair of entangled qubits that is received by the one of the two nodes in a quantum cache;

c) maintaining entanglement and coherence of the stored one qubit of the pair of entangled qubits in the quantum cache for subsequent unloading of the stored one qubit of the pair of entangled qubits, such that the unloaded stored one qubit of the pair of entangled qubits is coherent;

e) storing classical data comprising classical information that is tagged to a particular qubit, such that the one qubit of the pair of entangled qubits has associated classical information that is tagged to the one qubit of the pair of entangled qubits;

f) unloading the stored one qubit of the pair of entangled qubits at a desired time that is based on the stored associated classical information that is tagged to the one qubit of the pair of entangled qubits;

g) measuring the unloaded stored one qubit of the pair of entangled qubits; and

h) generating the shared correlated state information that is private from eavesdroppers based on the measurement.

15 . The method of claim 14 , wherein the desired time is on demand.

16 . The method of claim 14 , wherein the desired time is predetermined.

17 . The method of claim 14 , wherein the desired time is based on a lifetime of the qubit.

18 . The method of claim 14 , wherein the desired time is based on an application demand.

19 . The method of claim 18 , wherein the application demand is based on at least one of an entanglement property of a qubit, a basis of a qubit, a fidelity of a qubit, a time-of-arrival of a qubit, a source of a qubit, an age of a qubit, a half-life of a qubit, a birth time of a qubit, a time-of-flight of a qubit, a type of a qubit, or identity of other of the two nodes.

20 . The method of claim 14 , wherein the associated classical information that is tagged to the one qubit of the pair of entangled qubits comprises an index.