Quantum device, oscillation frequency setting method, and recording medium

1 . A quantum device comprising:

a plurality of oscillator groups;

a plurality of circulators;

a transmission path common to the plurality of circulators,

wherein each of the plurality of oscillator groups includes one or more oscillators having frequency variability,

wherein the one or more oscillators are connected to one port of one circulator of the plurality of circulators, the one circulator being common to the one or more oscillators,

wherein each of the plurality of circulators is arranged on the transmission path,

wherein each of the plurality of circulators is configured to:

transmit a signal from a first end of the transmission path to the plurality of oscillator groups;

transmit a signal from any of the plurality of oscillator groups to a second end of the transmission path;

block a signal from the second end of the transmission path so as not to transmit the signal to the plurality of oscillator groups; and

block a signal from any of the plurality of oscillator groups so as not to transmit the signal to the first end of the transmission path; and

one or more couplers each having a first end and a second end,

wherein the one or more oscillators are respectively directly connected to the one or more couplers at the first end of the respective coupler,

wherein the second end of each of the one or more couplers is directly connected to the one port of the one circulator,

wherein the one or more couplers are a capacitive coupling or an inductive coupling,

wherein at least one oscillator group of the plurality of oscillator groups includes a plurality of oscillators including the one or more oscillators, and

wherein an oscillation frequency of each oscillator in a same oscillator group of the at least one oscillator group is set so that, for any combination of two oscillators included in the same oscillator group, a difference in oscillation frequency between the two oscillators is greater than or equal to a width of a range defined as a frequency range in which the oscillator is susceptible to influences.

2 . The quantum device according to claim 1 , wherein an oscillation frequency of each oscillator included in all of the plurality of oscillator groups is different from each other.

3 . The quantum device according to claim 1 , further comprising:

an isolator that is provided between at least a pair of circulators of the plurality of circulators, the at least the pair of circulators being adjacent to each other in the transmission path, and that is configured to transmit a signal from the first end of the transmission path to the second end of the transmission path and to block a signal from the second end of the transmission path so as not to transmit the signal to the first end side of the transmission path.

4 . The quantum device according to claim 1 , wherein one of the plurality of circulators and one of the one or more oscillators are connected to each other.

5 . The quantum device according to claim 1 , wherein an oscillation frequency of each oscillator in different oscillator groups of the plurality of oscillator groups is set so that, for any combination of two oscillators included in the different oscillator groups, an oscillation frequency of the oscillator included in the oscillator group on a side of the first end of the two oscillators is outside a range defined as a frequency range in which the oscillator included in the oscillator group on the side of the second end is susceptible to influences.

6 . The quantum device according to claim 5 , wherein an upper limit value of the frequency range in which the oscillator is susceptible to influences is determined to be an oscillation frequency of the oscillator.

7 . The quantum device according to claim 5 , wherein the lower limit value of the frequency range in which the oscillator is susceptible to influences is determined to be a frequency obtained by subtracting a value within a range from 20 MHz to 800 MHz from the oscillation frequency of the oscillator.

8 . The quantum device according to claim 7 , wherein the lower limit value of the frequency range in which the oscillator is susceptible to influences is determined to be a frequency obtained by subtracting 100 MHz from the oscillation frequency of the oscillator.

9 . The quantum device according to claim 1 , wherein the one or more oscillators are Josephson parametric oscillators.

10 . A quantum device comprising:

a plurality of oscillator groups;

a plurality of circulators; and

a transmission path common to the plurality of circulators,

wherein each of the plurality of oscillator groups includes one or more oscillators having frequency variability,

wherein the one or more oscillators are connected to one port of one circulator of the plurality of circulators, the one circulator being common to the one or more oscillators,

wherein each of the plurality of circulators is arranged on the transmission path,

wherein each of the plurality of circulators is configured to:

transmit a signal from a first end of the transmission path to the plurality of oscillator groups;

transmit a signal from any of the plurality of oscillator groups to a second end of the transmission path;

block a signal from the second end of the transmission path so as not to transmit the signal to the plurality of oscillator groups; and

block a signal from any of the plurality of oscillator groups so as not to transmit the signal to the first end of the transmission path,

wherein an oscillation frequency of each oscillator in different oscillator groups of the plurality of oscillator groups is set so that, for any combination of two oscillators included in the different oscillator groups, an oscillation frequency of the oscillator included in the oscillator group on a side of the first end of the two oscillators is outside a range defined as a frequency range in which the oscillator included in the oscillator group on the side of the second end is susceptible to influences, and

wherein a lower limit value of the frequency range in which the oscillator is susceptible to influences is determined to be a frequency calculated based on an oscillation frequency of the oscillator, a Kerr coefficient, and a coherent state amplitude.

11 . An oscillation frequency setting method executed by a control device that controls a quantum device, the quantum device comprising: a plurality of oscillator groups; a plurality of circulators; and a transmission path common to the plurality of circulators, wherein each of the plurality of oscillator groups includes one or more oscillators having frequency variability, wherein the one or more oscillators are connected to one port of one circulator of the plurality of circulators, the one circulator being common to the one or more oscillators, wherein each of the plurality of circulators is arranged on the transmission path, wherein each of the plurality of circulators is configured to: transmit a signal from a first end of the transmission path to the plurality of oscillator groups; transmit a signal from any of the plurality of oscillator groups to a second end of the transmission path; block a signal from the second end of the transmission path so as not to transmit the signal to the plurality of oscillator groups; and block a signal from any of the plurality of oscillator groups so as not to transmit the signal to the first end of the transmission path, wherein at least one oscillator group of the plurality of oscillator groups includes a plurality of the oscillators including the one or more oscillators, the method comprising:

setting an oscillation frequency of each oscillator in a same oscillator group of the at least one oscillator group so that, for any combination of two oscillators included in the same oscillator group, a difference in oscillation frequency between the two oscillators is greater than or equal to a width of a range defined as a frequency range in which the oscillator is susceptible to influences.