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- Andreas Wallraff, David I. Schuster, +6 authors Robert J. Schoelkopf
- Nature
- 2004

The interaction of matter and light is one of the fundamental processes occurring in nature, and its most elementary form is realized when a single atom interacts with a single photon. Reaching this regime has been a major focus of research in atomic physics and quantum optics for several decades and has generated the field of cavity quantum… (More)

- Leonardo DiCarlo, Jerry M. Chow, +8 authors Robert J. Schoelkopf
- Nature
- 2009

Quantum computers, which harness the superposition and entanglement of physical states, could outperform their classical counterparts in solving problems with technological impact-such as factoring large numbers and searching databases. A quantum processor executes algorithms by applying a programmable sequence of gates to an initialized register of qubits,… (More)

- Andreas Wallraff, David I. Schuster, +5 authors Robert J. Schoelkopf
- Physical review letters
- 2005

In a Rabi oscillation experiment with a superconducting qubit we show that a visibility in the qubit excited state population of more than 95% can be attained. We perform a dispersive measurement of the qubit state by coupling the qubit non-resonantly to a transmission line resonator and probing the resonator transmission spectrum. The measurement process… (More)

- Nicolas Bergeal, Flavius Schackert, +7 authors Michel H. Devoret
- Nature
- 2010

Recent progress in solid-state quantum information processing has stimulated the search for amplifiers and frequency converters with quantum-limited performance in the microwave range. Depending on the gain applied to the quadratures of a single spatial and temporal mode of the electromagnetic field, linear amplifiers can be classified into two categories… (More)

- Leonardo DiCarlo, Matthew D. Reed, +7 authors Robert J. Schoelkopf
- Nature
- 2010

Traditionally, quantum entanglement has been central to foundational discussions of quantum mechanics. The measurement of correlations between entangled particles can have results at odds with classical behaviour. These discrepancies grow exponentially with the number of entangled particles. With the ample experimental confirmation of quantum mechanical… (More)

- Michael J. Hatridge, Sweta Shankar, +9 authors Michel H. Devoret
- Science
- 2013

Measuring a quantum system can randomly perturb its state. The strength and nature of this back-action depend on the quantity that is measured. In a partial measurement performed by an ideal apparatus, quantum physics predicts that the system remains in a pure state whose evolution can be tracked perfectly from the measurement record. We demonstrated this… (More)

- Sweta Shankar, Michael J. Hatridge, +7 authors Michel H. Devoret
- Nature
- 2013

Quantum error correction codes are designed to protect an arbitrary state of a multi-qubit register from decoherence-induced errors, but their implementation is an outstanding challenge in the development of large-scale quantum computers. The first step is to stabilize a non-equilibrium state of a simple quantum system, such as a quantum bit (qubit) or a… (More)

- Kurtis Geerlings, Zaki Leghtas, +5 authors Michel H. Devoret
- Physical review letters
- 2013

Qubit reset is crucial at the start of and during quantum information algorithms. We present the experimental demonstration of a practical method to force qubits into their ground state, based on driving appropriate qubit and cavity transitions. Our protocol, called the double drive reset of population, is tested on a superconducting transmon qubit in a… (More)

- Jaroslav Majer, Jerry M. Chow, +11 authors Robert J. Schoelkopf
- Nature
- 2007

Superconducting circuits are promising candidates for constructing quantum bits (qubits) in a quantum computer; single-qubit operations are now routine, and several examples of two-qubit interactions and gates have been demonstrated. These experiments show that two nearby qubits can be readily coupled with local interactions. Performing gate operations… (More)

- David I. Schuster, Adam P. Sears, +8 authors Robert J. Schoelkopf
- Physical review letters
- 2010

Electron spins in solids are promising candidates for quantum memories for superconducting qubits because they can have long coherence times, large collective couplings, and many qubits could be encoded into spin waves of a single ensemble. We demonstrate the coupling of electron-spin ensembles to a superconducting transmission-line cavity at strengths… (More)