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Analytical determination of participation in superconducting coplanar architectures
Conal E. Murray, Jay M. Gambetta, Douglas T. McClure +1
Superconducting qubits are sensitive to a variety of loss mechanisms which include dielectric loss from interfaces. The calculation of participation near the key interfaces of plan…
Measurement-induced qubit state mixing in circuit QED from up-converted dephasing noise
D. H. Slichter, R. Vijay, S. J. Weber +5
We observe measurement-induced qubit state mixing in a transmon qubit dispersively coupled to a planar readout cavity. Our results indicate that dephasing noise at the qubit-readou…
A superconducting qubit with Purcell protection and tunable coupling
J. M. Gambetta, A. A. Houck, Alexandre Blais
We present a superconducting qubit for the circuit quantum electrodynamics architecture that has a tunable coupling strength g. We show that this coupling strength can be tuned fro…
Quantum non-demolition measurement of microwave photons using engineered quadratic interactions
Chunqing Deng, J. M. Gambetta, A. Lupascu
We present a quantum electrical circuit with Josephson junctions formed of two anharmonic oscillators coupled with an interaction where and ar…
Implementing optimal control pulse shaping for improved single-qubit gates
J. M. Chow, L. DiCarlo, J. M. Gambetta +4
We employ pulse shaping to abate single-qubit gate errors arising from the weak anharmonicity of transmon superconducting qubits. By applying shaped pulses to both quadratures of r…
Preparation and Measurement of Three-Qubit Entanglement in a Superconducting Circuit
L. DiCarlo, M. D. Reed, L. Sun +7
Traditionally, quantum entanglement has played a central role in foundational discussions of quantum mechanics. The measurement of correlations between entangled particles can exhi…
Quantum Non-demolition Detection of Single Microwave Photons in a Circuit
B. R. Johnson, M. D. Reed, A. A. Houck +8
Thorough control of quantum measurement is key to the development of quantum information technologies. Many measurements are destructive, removing more information from the system…
Entangled photons on demand: Erasing which-path information with sidebands
W. A. Coish, J. M. Gambetta
The biexciton cascade in a quantum dot can be used to generate entangled-photon pairs rapidly and deterministically (on demand). However, due to a large fine-structure splitting be…
Ultrastrong coupling regime of cavity QED with phase-biased flux qubits
J. Bourassa, J. M. Gambetta, A. A. Abdumalikov +3
We theoretically study a circuit QED architecture based on a superconducting flux qubit directly coupled to the center conductor of a coplanar waveguide transmission-line resonator…
Demonstration of Two-Qubit Algorithms with a Superconducting Quantum Processor
L. DiCarlo, J. M. Chow, J. M. Gambetta +8
By harnessing the superposition and entanglement of physical states, quantum computers could outperform their classical counterparts in solving problems of technological impact, su…
Proposal for generating and detecting multi-qubit GHZ states in circuit QED
Lev S. Bishop, L. Tornberg, D. Price +8
We propose methods for the preparation and entanglement detection of multi-qubit GHZ states in circuit quantum electrodynamics. Using quantum trajectory simulations appropriate for…
Simple pulses for elimination of leakage in weakly nonlinear qubits
F. Motzoi, J. M. Gambetta, P. Rebentrost +1
In realizations of quantum computing, a two-level system (qubit) is often singled out of the many levels of an anharmonic oscillator. In these cases, simple qubit control fails on…
Two-Qubit State Tomography using a Joint Dispersive Read-Out
S. Filipp, P. Maurer, P. J. Leek +8
Quantum state tomography is an important tool in quantum information science for complete characterization of multi-qubit states and their correlations. Here we report a method to…
Quantum trajectory equation for multiple qubits in circuit QED: Generating entanglement by measurement
Chantal L. Hutchison, J. M. Gambetta, Alexandre Blais +1
In this paper we derive an effective master equation and quantum trajectory equation for multiple qubits in a single resonator and in the large resonator decay limit. We show that…
Randomized benchmarking and process tomography for gate errors in a solid-state qubit
J. M. Chow, J. M. Gambetta, L. Tornberg +7
We present measurements of single-qubit gate errors for a superconducting qubit. Results from quantum process tomography and randomized benchmarking are compared with gate errors o…
Controlling the spontaneous emission of a superconducting transmon qubit
A. A. Houck, J. A. Schreier, B. R. Johnson +8
We present a detailed characterization of coherence in seven transmon qubits in a circuit QED architecture. We find that spontaneous emission rates are strongly influenced by far o…
Non-linear dispersive regime of cavity QED: The dressed dephasing model
Maxime Boissonneault, J. M. Gambetta, Alexandre Blais
Systems in the dispersive regime of cavity quantum electrodynamics (QED) are approaching the limits of validity of the dispersive approximation. We present a model which takes into…
Suppressing Charge Noise Decoherence in Superconducting Charge Qubits
J. A. Schreier, A. A. Houck, Jens Koch +9
We present an experimental realization of the transmon qubit, an improved superconducting charge qubit derived from the Cooper pair box. We experimentally verify the predicted expo…
Observation of Berry's Phase in a Solid State Qubit
P. J. Leek, J. M. Fink, A. Blais +7
In quantum information science, the phase of a wavefunction plays an important role in encoding information. While most experiments in this field rely on dynamic effects to manipul…
Coupling Superconducting Qubits via a Cavity Bus
J. Majer, J. M. Chow, J. M. Gambetta +11
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…
Quantum trajectory approach to circuit QED: Quantum jumps and the Zeno effect
Jay Gambetta, Alexandre Blais, M. Boissonneault +3
We present a theoretical study of a superconducting charge qubit dispersively coupled to a transmission line resonator. Starting from a master equation description of this coupled…
Model for monitoring of a charge qubit using a radio-frequency quantum point contact including experimental imperfections
Neil P. Oxtoby, Jay Gambetta, H. M. Wiseman
The extension of quantum trajectory theory to incorporate realistic imperfections in the measurement of solid-state qubits is important for quantum computation, particularly for th…
Charge insensitive qubit design derived from the Cooper pair box
Jens Koch, Terri M. Yu, Jay Gambetta +7
Short dephasing times pose one of the main challenges in realizing a quantum computer. Different approaches have been devised to cure this problem for superconducting qubits, a pri…
Generating Single Microwave Photons in a Circuit
A. A. Houck, D. I. Schuster, J. M. Gambetta +8
Electromagnetic signals in circuits consist of discrete photons, though conventional voltage sources can only generate classical fields with a coherent superposition of many differ…