Superconducting circuit and method for driving the same
AssigneeNEC Corporation
InventorIchiro Ishida
Life of this patent
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Abstract
According to the present invention, there is provided a superconducting circuit including a Josephson tunnel junction 1 and a load resistor 2 connected in parallel to the Josephson tunnel junction, in which a current source 5 is connected to the input terminal for the Josephson tunnel junction 1 and which has a pulse generator 3 in order to superimpose a pulse current to the current i from the current source 5. As the input signal, a current pulse is given to the current i within the range of below the critical current of the Josephson tunnel junction by means of the foregoing pulse generator 3 so that an excellent separation of the input and output is achieved without using any magnetic coupling circuit.
Claims9
A superconducting circuit comprising;
- a Josephson tunnel junction;
- a load resistor connected in parallel to the Josephson tunnel junction;
- a current source connected to an input terminal of said Josephson tunnel junction, and
- means for changing a current supplied from said current source to the input terminal of said Josephson tunnel junction within a range below a critical current of said Josephson tunnel junction and wherein a rate of change of the current supplied to the input terminal of the Josephson tunnel junction is used as a controlling factor for switching said Josephson tunnel junction.
A method for driving a superconducting circuit comprising the steps of:
- providing a current change within a range below a critical current of the Josephson tunnel junction is given, as an input signal to an input terminal of the Josephson runnel junction connected in parallel to a load resistor, and
- Using a rate of said current change as a controlling factor for switching said Josephson tunnel junction,
A superconducting circuit comprising:
- a Josephson tunnel junction having an input terminal;
- a current source connected to said input terminal for applying a current thereto;
- means for changing said current between a first and a second magnitude, wherein both of said first and second magnitudes are less than a critical magnitude of said Josephson tunnel junction.
Dependencies are inferred from the claim text.