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- Frederick W Strauch, Philip R Johnson, Alex J Dragt, C J Lobb, J R Anderson, F C Wellstood
- Physical review letters
- 2003

Based on a quantum analysis of two capacitively coupled current-biased Josephson junctions, we propose two fundamental two-qubit quantum logic gates. Each of these gates, when supplemented by single-qubit operations, is sufficient for universal quantum computation. Numerical solutions of the time-dependent Schrödinger equation demonstrate that these… (More)

- A J Berkley, H Xu, +7 authors F C Wellstood
- Science
- 2003

We present spectroscopic evidence for the creation of entangled macroscopic quantum states in two current-biased Josephson-junction qubits coupled by a capacitor. The individual junction bias currents are used to control the interaction between the qubits by tuning the energy level spacings of the junctions in and out of resonance with each other. Microwave… (More)

- Huizhong Xu, Frederick W Strauch, +8 authors F C Wellstood
- Physical review letters
- 2005

We study the quantum mechanical behavior of a macroscopic, three-body, superconducting circuit. Microwave spectroscopy on our system, a resonator coupling two large Josephson junctions, produced complex energy spectra well explained by quantum theory over a large frequency range. By tuning each junction separately into resonance with the resonator, we first… (More)

- Frederick W Strauch, Kurt Jacobs, Raymond W Simmonds
- Physical review letters
- 2010

We present a method to synthesize an arbitrary quantum state of two superconducting resonators. This state-synthesis algorithm utilizes a coherent interaction of each resonator with a tunable artificial atom to create entangled quantum superpositions of photon number (Fock) states in the resonators. We theoretically analyze this approach, showing that it… (More)

- Frederick W Strauch
- Physical review letters
- 2012

An all-resonant method is proposed to control the quantum state of superconducting resonators. This approach uses a tunable artificial atom linearly coupled to resonators, and allows for efficient routes to Fock state synthesis, qudit logic operations, and synthesis of NOON states. This resonant approach is theoretically analyzed, and found to perform… (More)

- Xiaoting Wang, Sai Vinjanampathy, Frederick W Strauch, Kurt Jacobs
- Physical review letters
- 2011

The present state of the art in cooling mechanical resonators is a version of sideband cooling. Here we present a method that uses the same configuration as sideband cooling-coupling the resonator to be cooled to a second microwave (or optical) auxiliary resonator-but will cool significantly colder. This is achieved by varying the strength of the coupling… (More)

- Frederick W Strauch
- Physical review. E, Statistical, nonlinear, and…
- 2007

We derive an exact propagation scheme for nonlinear Schrödinger equations. This scheme is entirely analogous to the propagation of linear Schrödinger equations. We accomplish this by defining a special operator whose algebraic properties ensure the correct propagation. As applications, we provide a simple proof of a recent conjecture regarding higher-order… (More)

- Christopher Chudzicki, Frederick W Strauch
- Physical review letters
- 2010

We study the routing of quantum information in parallel on multidimensional networks of tunable qubits and oscillators. These theoretical models are inspired by recent experiments in superconducting circuits. We show that perfect parallel state transfer is possible for certain networks of harmonic oscillator modes. We extend this to the distribution of… (More)

- Philip R. Johnson, Frederick W. Strauch, +4 authors F. C. Wellstood
- 2003

We show that two capacitively coupled Josephson junctions, in the quantum limit, form a simple coupled qubit system with effective coupling controlled by the junction bias currents. We compute numerically the energy levels and wave functions for the system, and show how these may be tuned to make optimal qubits. The dependence of the energy levels on the… (More)

- Xiaoting Wang, Sai Vinjanampathy, Frederick W Strauch, Kurt Jacobs
- Physical review letters
- 2013

Here we address the question of just how cold one can cool a quantum system, given that the size of the control forces is limited. We solve this problem fully, within the dual regimes of (i) weak coupling, defined as that in which the thermalization dynamics of the system is preserved, and (ii) relatively strong control, being that in which appreciable… (More)