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--></style><title>MIT Quantum Information Processing Seminar
Reminder</title></head><body>
<div>Today's MIT QIP seminar will take place on Monday, Dec. 6 at
16:00 in 4-237, and features:</div>
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<hr>
<div align="center"><font size="+2"><b>Circuit Quantum
Electrodynamics:</b></font></div>
<div align="center"><font size="+2"><b>Doing Quantum Optics with
Superconductors</b></font></div>
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<div align="center"><font size="+1"><i>by</i> Robert Schoelkopf
(<i>Dept. of Physics, Yale Univ.</i>)</font></div>
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<div align="center"><u>ABSTRACT</u></div>
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<blockquote>I will describe recent experiments in which the strong
coupling limit of cavity quantum electrodynamics has been realized for
the first time using superconducting circuits. In our approach, we use
a Cooper-pair box as an artificial atom, which is coupled to a
one-dimensional cavity formed by a transmission line resonator. When
the Cooper-pair box qubit is detuned from the cavity resonance
frequency, we perform high-fidelity dispersive quantum non-demolition
read-out of the qubit state. Using this read-out technique, we have
characterized the qubit properties spectroscopically, performed Rabi
oscillations of the qubit, and attained coherence times greater than
200 ns, indicating that this architecture is extremely attractive for
quantum computing and control. In the case when the qubit is tuned
into resonance with the cavity, we observe the vacuum Rabi splitting
of the cavity mode, indicating that the strong coupling regime is
attained, and coherent superpositions between the qubit and a single
photon are generated.</blockquote>
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<div>This will be the last seminar of the Fall Semester; Merry
Xmas!</div>
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