Qubit readout via resonant scattering of josephson solitons
AssigneeNorthrop Grumman Systems Corporation
InventorsOfer Naaman, Jae I. Park, Aaron A. Pesetski
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Abstract
Systems and methods are provided for reading an associated state of a qubit. A first soliton is injected along a first Josephson transmission line coupled to the qubit. A velocity of the first soliton is selected according to a physical length of the qubit and a characteristic frequency of the qubit. A second soliton is injected at the selected velocity along a second Josephson transmission line that is not coupled to the qubit. A delay associated with the first soliton is determined relative to the second soliton.
Claims20
An apparatus comprising:
- a Josephson transmission line;
- a soliton driver configured to provide a soliton to propagate along the Josephson transmission line;
- a soliton detector configured to determine a time-of-flight of the soliton;
- and
- a phase qubit coupled to the Josephson transmission line, the phase qubit having a first characteristic frequency in a first state and a second characteristic frequency in a second state;
- wherein at least one of the soliton detector, the Josephson transmission line, and the phase qubit are configured such that the phase qubit applies a first delay to the propagation of the soliton along the Josephson transmission line when the phase qubit is in the first state and applies a second delay to the propagation of the soliton along the Josephson transmission line when the phase qubit is in the second state.
An apparatus, comprising:
- a first Josephson transmission line;
- a qubit coupled to the first Josephson transmission line;
- a second Josephson transmission line that is not coupled to the qubit;
- a soilton driver configured to inject a first soliton along the first Josephson transmission line and a second soliton along the second Josephson transmission line, the first and second solitons having a velocity selected according to a physical length of the qubit and a characteristic frequency of the qubit;
- and
- a soliton detector configured to detect an arrival of each of the first soliton and the second soliton and determine a delay associated with the first soliton relative to the second soliton.
A method for reading an associated state of a qubit, comprising:
- producing a first soliton along a first Josephson transmission line coupled to the qubit, a velocity of the first soliton being selected according to a physical length of the qubit and a characteristic frequency of the qubit;
- producing a second soliton at the selected velocity along a second Josephson transmission line that is not coupled to the qubit;
- and
- determining a delay associated with the first soliton relative to the second soliton.
An apparatus comprising:
- a Josephson transmission line terminated with impedance mismatched ends to allow for internal reflection of a soliton;
- a soliton driver configured to provide the soliton to propagate along the Josephson transmission line;
- a soliton detector configured to determine a time-of-flight of the soliton;
- and
- a phase qubit coupled to the Josephson transmission line, the phase qubit having a first characteristic frequency in a first state and a second characteristic frequency in a second state;
- wherein at least one of the soliton detector, the Josephson transmission line, and the phase qubit are configured such that the phase qubit applies a first delay multiple times to the propagation of the soliton along the Josephson transmission line when the phase qubit is in the first state and applies a second delay multiple times to the propagation of the soliton along the Josephson transmission line when the phase qubit is in the second state.
Dependencies are inferred from the claim text.