Achieving orthogonal control of non-orthogonal qubit parameters of a logical qubit allows for increasing the length of a qubit chain thereby increasing the effective connectivity of the qubit chain. A hybrid qubit is formed by communicatively coupling a dedicated second qubit to a first qubit. By tuning a programmable parameter of the second qubit of a hybrid qubit, an effective programmable parameter of the hybrid qubit is adjusted without affecting another effective programmable parameter of the hybrid qubit thereby achieving orthogonal control of otherwise non-orthogonal qubit parameters. The length of the logical qubit may thus be increased by communicatively coupling a plurality of such hybrid qubits together.
Please help me write a proper abstract based on the patent claims. CLAIM: 1. A method of controlling qubit parameters in a quantum processor, wherein the quantum processor includes a plurality of qubits, each qubit having a respective first programmable parameter and a respective second programmable parameter that at least partially depends on the respective first programmable parameter, and a plurality of coupling devices that each selectively provide communicative coupling between respective pairs of the qubits, the method comprising: communicatively coupling at least three of the qubits to one another as a single logical qubit, the single logical qubit formed by a first outermost qubit, a second outermost qubit and at least one intermediary qubit, the at least one intermediary qubit strongly communicatively coupled between the first and the second outermost qubits, the first outmost qubit being an outermost qubit of the qubits of the logical qubit in a first direction along a logical qubit path defined by the qubits of the logical qubit and the second outermost qubit being an outermost qubit in a second direction along the logical qubit path; programming the first and the second outermost qubits to have respective first programmable parameters less than or equal to a first value; and programming the at least one of the intermediate qubits to have at least approximately near zero spin and to have respective values of the first programmable parameter higher than the first value. 2. The method of claim 1 wherein: communicatively coupling at least three of the qubits to one another as a single logical qubit includes communicatively coupling at least two qubits as respective intermediate qubits communicatively coupled between the first and the second outermost qubits; and programming the at least one intermediate qubit to have at least approximately near zero spin and to have respective values of the first programmable parameter higher than the first value includes programming all of the intermediate qubits to have at least approximately near zero spin and to have respective values of the first programmable parameter higher than the first value. 3. The method of claim 1 wherein the first programmable parameter is tunneling amplitude, and programming the first programmable parameter of the first and the second outermost qubits includes programming a respective tunneling amplitude of the first and the second outermost qubits via a programming subsystem. 4. The method of claim 3 wherein the second programmable parameter is a persistent current of the second qubit, and wherein programming the tunneling amplitude of the at least one of the intermediate qubits includes programming a respective tunneling amplitude of the at least one of the intermediate qubits via the programming subsystem without substantially affecting the persistent current of the first and the second outermost qubits. 5. A quantum processor apparatus, comprising: a plurality of qubits, each qubit having a respective first programmable parameter and a respective second programmable parameter that at least partially depends on the respective first programmable parameter, and a plurality of coupling devices that each selectively provide communicative coupling between respective pairs of the plurality of qubits, wherein: at least three of the plurality of qubits are communicatively coupled to one another as a single logical qubit, the single logical qubit formed by a first outermost qubit, a second outermost qubit and at least one intermediary qubit, the at least one intermediary qubit strongly communicatively coupled between the first outermost qubit and the second outermost qubit, the first outmost qubit being an outermost qubit of the qubits of the logical qubit in a first direction along a logical qubit path defined by the qubits of the logical qubit and the second outermost qubit being an outermost qubit in a second direction along the logical qubit path; the first outermost qubit and the second outermost qubit have respective first programmable parameters less than or equal to a first value; and the at least one of the at least three of the plurality of qubits have at least approximately near zero spin and have respective values of the first programmable parameter higher than the first value. 6. The quantum processor apparatus of claim 5 wherein: the single logical qubit includes at least two qubits as respective intermediate qubits communicatively coupled between the first outermost qubit and the second outermost qubit, and all of the intermediate qubits have at least approximately near zero spin and have respective values of the first programmable parameter higher than the first value. 7. The quantum processor apparatus of claim 6 wherein the first programmable parameter is tunneling amplitude, and a respective tunneling amplitude of the first and the second outermost qubits is less than or equal to the first value. 8. The quantum processor apparatus of claim 7 wherein the second programmable parameter is a persistent current of the second outermost qubit, and a respective tunneling amplitude of the at least one of the intermediate qubits does not substantially affect the persistent current of the first outermost qubit and the second outermost qubit. 9. The quantum processor apparatus of claim 5, further comprising: at least one first programming subsystem communicatively coupleable to a compound Josephson junction of at least one of the qubits and operable to program a tunneling amplitude of the at least one of the qubits; and at least one second programming subsystem communicatively coupleable to a qubit loop of at least one of the qubits and operable to program a persistent current of the at least one of the qubits. 10.-39. (canceled) 40. A method of controlling qubit parameters in a quantum processor, wherein the quantum processor includes a plurality of qubits, each qubit having a respective first programmable parameter and a respective second programmable parameter that at least partially depends on the respective first programmable parameter, and a plurality of coupling devices that each provide communicative coupling between respective sets of at least two qubits from the plurality of qubits, the method comprising: communicatively coupling a first qubit from the plurality of qubits and a second qubit from the plurality of qubits via a first coupling device from the plurality of coupling devices such that the first qubit, the second qubit, and the first coupling device collectively behave as a first logical qubit having an effective first programmable parameter that at least partially depends on the first programmable parameter of the first qubit and the first programmable parameter of the second qubit and an effective second programmable parameter that at least partially depends on the second programmable parameter of the first qubit and the second programmable parameter of the second qubit; and programming the effective first programmable parameter of the first logical qubit via a programming subsystem, wherein programming the effective first programmable parameter of the first logical qubit includes programming the first programmable parameter of the first qubit via the programming subsystem, wherein the first programmable parameter of the first qubit is independent of the second programmable parameter of the second qubit such that programming the first programmable parameter of the first qubit does not substantially affect the second programmable parameter of the second qubit. 41. The method of claim 40, further comprising: communicatively coupling a third qubit from the plurality of qubits and either the first qubit from the plurality of qubits or the second qubit from the plurality of qubits via a second coupling device from the plurality of coupling devices such that the first qubit, the second qubit, the third qubit, the first coupling device, and the second coupling device collectively behave as the first logical qubit, wherein the effective first programmable parameter of the first logical qubit at least partially depends on the first programmable parameter of the third qubit and the effective second programmable parameter of the first logical qubit at least partially depends on the second programmable parameter of the third qubit. 42. The method of claim 40 wherein programming the first programmable parameter of the first qubit via the programming subsystem includes programming a tunneling amplitude of the first qubit via the programming subsystem. 43. The method of claim 42 wherein the second programmable parameter of the second qubit is a persistent current of the second qubit, and wherein programming the tunneling amplitude of the first qubit via the programming subsystem includes programming the tunneling amplitude of the first qubit via the programming subsystem without substantially affecting the persistent current of the second qubit. 44. The method of claim 40 wherein programming the effective first programmable parameter of the first logical qubit via the programming subsystem includes programming an effective tunneling amplitude of the first logical qubit via the programming subsystem. 45. The method of claim 40 wherein programming the effective first programmable parameter of the first logical qubit via the programming subsystem includes programming the first programmable parameter of the second qubit via the programming subsystem, and wherein the first programmable parameter of the second qubit is independent of the second programmable parameter of the first qubit such that programming the first programmable parameter of the second qubit via the programming subsystem does not substantially affect the second programmable parameter of the first qubit. 46. The method of claim 45 wherein programming the first programmable parameter of the second qubit via the programming subsystem includes programming a tunneling amplitude of the second qubit via the programming subsystem. 47. The method of claim 40, further comprising: programming the effective second programmable parameter of the first logical qubit via the programming subsystem, wherein programming the effective second programmable parameter of the first logical qubit includes programming the second programmable parameter of the first qubit via the programming subsystem, wherein the second programmable parameter of the first qubit is independent of the first programmable parameter of the second qubit such that programming the second programmable parameter of the first qubit does not substantially affect the first programmable parameter of the second qubit. 48. The method of claim 40, further comprising: programming the effective second programmable parameter of the first logical qubit via the programming subsystem, wherein programming the effective second programmable parameter of the first logical qubit includes programming the second programmable parameter of the second qubit via the programming subsystem, and wherein programming the second programmable parameter of the second qubit does not substantially affect the first programmable parameter of the first qubit. 49.-64. (canceled) 65. A method of achieving orthogonal control of at least two qubit parameters in a quantum processor, the method comprising: communicatively coupling a first qubit and a second qubit such that the first qubit and the second qubit together behave as a single logical qubit, wherein the first qubit includes a first programmable parameter and a second programmable parameter, the second programmable parameter of the first qubit at least partially dependent on the first programmable parameter of the first qubit, and wherein the second qubit includes at least a first programmable parameter, the second programmable parameter of the first qubit substantially independent of the first programmable parameter of the second qubit; and programming an effective first programmable parameter of the logical qubit via a programming subsystem without substantially affecting an effective second programmable parameter of the logical qubit, wherein the effective first programmable parameter of the logical qubit at least partially depends on the first programmable parameter of the first qubit and the first programmable parameter of the second qubit and the effective second programmable parameter of the logical qubit at least partially depends on the second programmable parameter of the first qubit, and wherein programming the effective first programmable parameter of the logical qubit via the programming subsystem includes programming the first programmable parameter of the second qubit via the programming subsystem without substantially affecting the second programmable parameter of the first qubit. 66. The method of claim 65, further comprising: programming the effective second programmable parameter of the logical qubit via the programming subsystem, wherein programming the effective second programmable parameter of the logical qubit includes programming the second programmable parameter of the first qubit via the programming subsystem. 67. The method of claim 65 wherein: the first qubit comprises a first qubit loop formed by a first closed superconducting current path and a first compound Josephson junction that interrupts the first qubit loop; the second qubit comprises a second qubit loop formed by a second closed superconducting current path and a second compound Josephson junction that interrupts the second qubit loop; and communicatively coupling the first qubit and the second qubit such that the first qubit and the second qubit together behave as a single logical qubit includes communicatively coupling the first qubit and the second qubit via a coupling device such that the first qubit, the second qubit, and the coupling device collectively behave as a single logical qubit. 68. The method of claim 67 wherein communicatively coupling the first qubit and the second qubit via a coupling device such that the first qubit, the second qubit, and the coupling device collectively behave as a single logical qubit includes inductively coupling the first qubit and the coupling device and inductively coupling the second qubit and the coupling device. 69. The method of claim 65 wherein: the first qubit comprises a first qubit loop formed by a first closed superconducting current path and a first compound Josephson junction that interrupts the first qubit loop; the second qubit comprises a second qubit loop formed by a second closed superconducting current path, a first Josephson junction that interrupts the second qubit loop, and a second compound Josephson junction that interrupts the second qubit loop; and communicatively coupling the first qubit and the second qubit such that the first qubit and the second qubit together behave as a single logical qubit includes galvanically coupling the first qubit loop of the first qubit and the second qubit loop of the second qubit such that a portion of the second superconducting current path includes a portion of the first superconducting current path and is shared between the first and second superconducting current paths, and such that the first Josephson junction that interrupts that second qubit loop interrupts the portion of the second superconducting current path that is shared between the first and second superconducting current paths. 70. The method of claim 69 wherein the second qubit further comprises a second Josephson junction that interrupts the second qubit loop; and communicatively coupling the first qubit and the second qubit such that the first qubit and the second qubit together behave as a single logical qubit includes galvanically coupling the first qubit loop of the first qubit and the second qubit loop of the second qubit such that the second Josephson junction that interrupts the second qubit loop interrupts a portion of the second superconducting current path that is not shared between the first and second superconducting current paths. 71. The method of claim 65 wherein programming the effective first programmable parameter of the logical qubit via the programming subsystem includes programming an effective tunneling amplitude of the logical qubit, and wherein programming the first programmable parameter of the second qubit via the programming subsystem includes programming a tunneling amplitude of the second qubit via the programming subsystem. 72. The method of claim 71 wherein the second programmable parameter of the first qubit is a persistent current of the first qubit, and wherein programming the tunneling amplitude of the second qubit via the programming subsystem does not substantially affect the persistent current of the first qubit.