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Demonstration of conditional gate operation using superconducting charge qubits.

T Yamamoto1, Yu A Pashkin, O Astafiev

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|October 31, 2003
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This summary is machine-generated.

Researchers demonstrated a controlled-NOT (C-NOT) logic gate operation on coupled superconducting charge qubits. This significant step advances solid-state quantum computing by enabling conditional gate operations for qubits.

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Area of Science:

  • Quantum Computing
  • Solid-State Physics
  • Superconducting Qubits

Background:

  • Superconducting charge qubits based on Josephson junctions show promise for quantum computing due to scalability.
  • Progress in coherence times and read-out schemes has been made, but realizing logic gates remains a challenge.
  • Previous work demonstrated coherent oscillations and microwave spectroscopy of coupled superconducting qubits.

Purpose of the Study:

  • To demonstrate conditional gate operation using a pair of coupled superconducting charge qubits.
  • To advance the development of solid-state quantum computing by realizing fundamental logic gates.

Main Methods:

  • Utilized a pair of capacitively coupled superconducting charge qubits.
  • Employed a pulse technique to prepare different input states.
  • Observed the transformation of qubit state amplitudes to demonstrate gate operation.

Main Results:

  • Successfully demonstrated conditional gate operation on coupled superconducting charge qubits.
  • Showed that the amplitude of input states can be transformed via controlled-NOT (C-NOT) gate operation.
  • The phase evolution during the gate operation requires further clarification.

Conclusions:

  • Conditional gate operation using coupled superconducting charge qubits has been achieved.
  • This work represents a crucial step towards building a scalable solid-state quantum computer.
  • Further research is needed to fully understand and control the phase evolution in these gate operations.