Quantum electronic device
This disclosure relates to quantum electronic devices for storing qubits. In particular, this disclosure relates to a quantum electronic device comprising a carbon nanosphere adapted to store a qubit represented by an electron spin and a control and readout device to set the qubit and read the qubit stored on the carbon nanosphere. Qubits stored on carbon nanospheres have a long electron spin lifetime at room temperature. This disclosure further relates to a method for quantum computing. The method comprises storing a qubit represented by an electron spin on a carbon nanosphere, performing a quantum operation on the qubit to generate a resulting qubit and reading the resulting qubit from the nanosphere. There is further provided a spintronic device comprising multiple carbon nanospheres adapted to provide a qubit represented by an electron spin in that carbon nanosphere and a control device to facilitate interaction between the qubits to perform a quantum operation.
1. A quantum electronic device comprising:
a carbon nanosphere adapted to store a qubit represented by an electron spin; and
a control and readout device to set the qubit and read the qubit stored on the carbon nanosphere, wherein the carbon nanosphere is not hollow and the carbon nanosphere comprises:
metallic electron spin states delocalised over the volume of the carbon nanosphere, the electron spin states being itinerant in nature with electron spin lifetimes at room-temperature of at least 115 nanoseconds, and
short graphitic fragments that form unclosed shells following the curvature of a sphere.
2. The quantum electronic device of claim 1 , wherein the carbon nanosphere has a diameter of between 10 nm and 150 nm.
3. The quantum electronic device of claim 1 , wherein the carbon nanospheres has a diameter of 35 nm.
4. The quantum electronic device of claim 1 , wherein the carbon nanosphere is at a temperature between −40 degrees Celsius and +40 degrees Celsius.
5. A method for quantum computing, the method comprising:
storing a qubit represented by an electron spin on the carbon nanosphere of the quantum electronic device according to claim 1 ;
performing a quantum operation on the qubit to generate a resulting qubit; and
reading the resulting qubit from the nanosphere.
6. The quantum electronic device of claim 1 , wherein the quantum electronic device is a spintronic device comprising:
multiple carbon nanospheres each of which being adapted to provide a qubit represented by an electron spin in that carbon nanosphere; and
a control device to facilitate interaction between the qubits on the multiple carbon nanospheres to perform a quantum operation.
7. The quantum electronic device of claim 6 , further comprising:
a conductor coupled to the carbon nanospheres to provide transport of electrons that carry the electron spin.
8. The quantum electronic device of claim 7 , wherein the conductor comprises a graphene structure.
9. The quantum electronic device of claim 7 , further comprising an electrode associated with each of the multiple carbon nanospheres.
10. The quantum electronic device of claim 9 , further comprising an isolation layer to isolate the electrodes from the multiple carbon nanospheres.
11. The quantum electronic device of claim 10 , wherein the isolation layer has a thickness between 200 nm to 400 nm.
12. The quantum electronic device of claim 10 , wherein the isolation layer comprises an SiO 2 layer.
13. The quantum electronic device of claim 6 , wherein a distance between the multiple carbon nanospheres is such that the spin is not lost during transport between the multiple carbon nanospheres.
14. The quantum electronic device of claim 13 , wherein the distance between the multiple carbon nanospheres is between 50 nm and 1,000 nm.
15. Use of a carbon nanosphere for the fabrication of the quantum electronic device of claim 1 .
16. The quantum electronic device of claim 2 , wherein the carbon nanosphere has a diameter of between 20 nm and 55 nm.