Enhancing qubit-qubit interactions between separate chips with spiral resonators
View Patent ↗Various systems and methods are presented regarding utilizing a spiral resonator to enhance coupling between a first inductor loop and a second inductor loop to enable coupling between a first qubit and a second qubit. Operation of the first inductor loop can be controlled by a flux-tunable TCQ coupler, wherein flux-tuning can adjust operation from an OFF state (no coupling between the first qubit and the second qubit) to an ON state (the first qubit and second qubit are coupled). The spiral resonator can be located at the center of, and in the same plane as the loop of the first inductor loop. The spiral resonator can enhance inductive coupling between the first loop inductor and the second loop inductor.
1 . A system, comprising:
a first substrate having located thereon:
a first quantum bit (qubit) located in a first quantum array connected to a first inductor loop coupled to a spiral resonator; and
a second substrate, having located thereon:
a second qubit located in a second quantum array connected to a second inductor loop, wherein the first substrate and second substrate are separate, and the first qubit and the second qubit are coupled via electrical interaction between the first inductor loop and the second inductor loop, wherein the spiral resonator enhances coupling between the first and second qubits.
2 . The system of claim 1 , further comprising a flux-tunable coupler configured to operate in two states, an ON state and an OFF state, wherein during operation in the ON state, the first qubit and the second qubit are coupled for entanglement to occur, and during operation in the OFF state, the first qubit and the second qubit are not coupled or entangled.
3 . The system of claim 2 , wherein the flux-tunable coupler further comprises a Superconducting Quantum Interference Device (SQUID) junction and operation of the flux-tunable coupler is switched between the ON state and the OFF state via an externally applied magnetic field to the SQUID junction.
4 . The system of claim 3 , wherein the flux-tunable coupler comprises a superconducting multimode qubit coupler.
5 . The system of claim 3 , wherein the flux-tunable coupler comprises a tunable transmission line shunted plasma oscillation (transmon) coupler.
6 . The system of claim 1 , wherein the first qubit is a first transmission line shunted plasma oscillation (transmon) qubit and the second qubit is a second transmon qubit.
7 . The system of claim 1 , wherein the spiral resonator is operated at a frequency higher than a frequency of the first qubit or the second qubit.
8 . The system of claim 1 , wherein the spiral resonator has an operational frequency in the range of 5.5 GHz to 6.5 GHz.
9 . The system of claim 1 , wherein the spiral resonator comprises at least niobium.
10 . A quantum computing system, comprising:
at least one processor; and
a memory operatively coupled to the at least one processor and having instructions stored thereon, wherein, in response to the at least one processor, the instructions facilitate performance of operations, comprising:
controlling operation of a flux-tunable coupler to couple a first qubit with a second qubit, the first qubit is connected to a first inductor loop and the second qubit is coupled to a second inductor loop, wherein the second inductor loop is proximate to the first inductor loop, and a spiral resonator is located proximate to the first inductor loop, wherein the first qubit is coupled to the second qubit via the first inductor loop and the second inductor loop, wherein the spiral resonator enhances coupling between the first and second qubits.
11 . The quantum computing system of claim 10 , wherein the flux-tunable coupler is configured to operate in two states, an ON state and an OFF state, wherein during operation in the ON state, the first qubit and the second qubit are coupled for entanglement to occur, and during operation in the OFF state, the first qubit and the second qubit are not coupled, wherein the flux-tunable coupler is connected to the first inductor loop.
12 . The quantum computing system of claim 11 , wherein the flux-tunable coupler further comprises a Superconducting Quantum Interference Device (SQUID) junction and an operation of the flux-tunable coupler is switched between the ON state and the OFF state via application of flux to the SQUID junction.
13 . The quantum computing system of claim 10 , wherein the first qubit is a first transmission line shunted plasma oscillation (transmon) qubit and the second qubit is a second transmon qubit.
14 . The quantum computing system of claim 10 , wherein the spiral resonator has a resonant frequency higher than a frequency of the first qubit or the second qubit during operation of the flux-tunable coupler.
15 . The quantum computing system of claim 10 , wherein the spiral resonator has a resonant frequency in the range of 5.5 GHz to 6.5 GHz.
16 . The quantum computing system of claim 10 , wherein the first qubit is located on a first integrated circuit (IC) and the second qubit is located on a second IC, the first IC and the second IC are co-located in a qubit array.
17 . A computer-implemented method, comprising employing a processor and memory to instruct computer executable components to perform the following acts:
controlling operation of a flux-tunable coupler to couple a first qubit with a second qubit, the first qubit is connected to a first inductor loop and the second qubit is coupled to a second inductor loop, wherein the second inductor loop is proximate to the first inductor loop, and a spiral resonator is located proximate to the first inductor loop, wherein the first qubit is coupled to the second qubit via the first inductor loop and the second inductor loop, wherein the spiral resonator enhanced coupling between the first and second qubits.
18 . The computer-implemented method of claim 17 :
wherein the flux-tunable coupler is connected to the first inductor loop and further comprises a Superconducting Quantum Interference Device (SQUID) junction and an operation of the flux-tunable coupler is switched between an ON state and an OFF state via application of flux to the SQUID junction, during operation in the ON state, the first qubit and the second qubit are coupled for entanglement to occur, and during operation in the OFF state, the first qubit and the second qubit are not coupled.
19 . The computer-implemented method according to claim 17 , wherein the spiral resonator has a resonant frequency higher than a frequency of the first qubit or the second qubit during operation of the flux-tunable coupler.
20 . The computer-implemented method of claim 17 , wherein the first qubit is a first transmission line shunted plasma oscillation (transmon) qubit and the second qubit is a second transmon qubit.