Quantum communications of a two-qubit state
View Patent ↗In one aspect, there is provided a method for transmitting a two-qubit state. The method includes: propagating the two-qubit state onto a transmission waveguide, wherein the propagating includes distributing the two-qubit state about a certain phase; and transmitting the two-qubit state through the transmission waveguide using a pump pulse having the certain phase, wherein the pump pulse is provided in a manner so that the transmission waveguide functions as an optical phase sensitive amplifier (OPSA).
1. A method for transmitting a two-qubit state, the method comprising:
propagating the two-qubit state onto a transmission waveguide, wherein the propagating includes distributing the two-qubit state about a certain phase; and
transmitting the two-qubit state through the transmission waveguide using a pump pulse having the certain phase, wherein the pump pulse is provided in a manner so that the transmission waveguide functions as an optical phase sensitive amplifier (OPSA).
2. The method of claim 1 , wherein two-qubit state includes non-orthogonal quantum states.
3. The method of claim 1 , wherein the two-qubit state is phase misaligned with the certain phase, and the pump pulse is capable of transmitting the two-qubit state notwithstanding the phase misalignment of the two-qubit state.
4. The method of claim 1 , wherein the transmission waveguide comprises a length of optical fiber and the transmitting comprises amplifying the two-qubit state over the length of the optical fiber using the pump pulse.
5. The method of claim 1 , wherein the method is a method for transmitting multiple two-qubit states, and the two-qubit state is one of the multiple two-qubit states.
6. The method of claim 1 , wherein the pump pulse is provided in a manner so that the transmission waveguide functions as a distributed optical pulse sensitive amplifier (OPSA).
7. The method of claim 1 , wherein the two-qubit state includes entangled quantum states.
8. The method of claim 1 , wherein the transmission waveguide comprises a length of optical fiber and the transmitting comprises loss resilient transmission of the two-qubit state over the length of the optical fiber using the pump pulse.
9. The method of claim 1 , wherein the method is a method for transmitting variable two-qubit states, and the variable two-qubit states are selected from a state space defined by varying the relative time-bin phase, φ, wherein
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10. A device for transmitting a two-qubit state, the device comprising:
a source, the source being configured to distribute the two-qubit state about a certain phase; and
a transmission waveguide, the transmission waveguide being configured to propagate the two-qubit state using a pump pulse having the certain phase, wherein the transmission waveguide comprises an optical phase sensitive amplifier (OPSA), the OPSA being configured to use the pump pulse with the certain phase.
11. A device for transmitting a two-qubit state, the device comprising:
a source, the source being configured to distribute the two-qubit state about a certain phase;
wherein the device is operative to use a pump pulse having the certain phase to transmit the two-qubit state through a transmission waveguide, wherein the device is operative to provide the pump pulse in a manner to configure the transmission waveguide as an optical phase sensitive amplifier (OPSA).
12. The device of claim 11 , wherein two-qubit state includes non-orthogonal quantum states.
13. The device of claim 11 , wherein the two-qubit state is phase misaligned with the certain phase, and the pump pulse is capable of transmitting the two-qubit state notwithstanding the phase misalignment of the two-qubit state.
14. The device of claim 11 , wherein the device is operative so that the two-qubit state constructively interferes with amplitude for pair creation in the amplifying transmission waveguide thereby facilitating transmission of the two-qubit state through the transmission waveguide.
15. The device of claim 11 , wherein the device is operative to provide the pump pulse in a manner so that the transmission waveguide functions as a distributed optical pulse sensitive amplifier (OPSA).
16. The device of claim 11 , wherein the two-qubit state includes entangled quantum states.
17. The device of claim 11 , wherein the device is operative so that the two-qubit state constructively interferes with the amplitude for pair creation in the amplifying transmission waveguide thereby facilitating loss resilient transmission of the two-qubit state through the transmission waveguide.
18. The device of claim 11 , wherein the device is operative for transmitting multiple two-qubit states in parallel, wherein the multiple two-qubit states are frequency multiplexed onto a common transmission channel.
19. The device of claim 11 , wherein the device is operative for transmitting variable two-qubit states, and the variable two-qubit states are selected from a state space defined by varying the relative time-bin phase, φ, wherein
ψ
±
(
ϕ
)
〉
=
1
2
[
ⅇ
±
ⅈ
ϕ
00
〉
+
ⅇ
∓
ⅈϕ
11
〉
]
.