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- R. Ruskov, A. N. Korotkov
- 2001

The principle of feedback control is used in a wide variety of physical and engineering problems. For example, it can be applied in a straightforward way to tune the oscillation phase of a harmonic oscillator in order to achieve a desired synchronization. An intriguing and fundamental question is whether continuous feedback can be used to control quantum… (More)

- C H Yang, A Rossi, +7 authors A S Dzurak
- Nature communications
- 2013

Although silicon is a promising material for quantum computation, the degeneracy of the conduction band minima (valleys) must be lifted with a splitting sufficient to ensure the formation of well-defined and long-lived spin qubits. Here we demonstrate that valley separation can be accurately tuned via electrostatic gate control in a… (More)

We analyze squeezing of the nanoresonator state produced by periodic measurement of position by a quantum point contact or a single-electron transistor. The mechanism of squeezing is the stroboscopic quantum nondemolition measurement generalized to the case of continuous measurement by a weakly coupled detector. The magnitude of squeezing is calculated for… (More)

We have developed a formalism suitable for calculation of the output spectrum of a detector continuously measuring quantum coherent oscillations in a solid-state qubit, starting from microscopic generalized Bloch equations. The results coincide with those obtained using Bayesian and master equation approaches. The previous results are generalized to the… (More)

- Rusko Ruskov, Alexander N Korotkov, Ari Mizel
- Physical review letters
- 2006

With the recent surge of interest in quantum computation, it has become very important to develop clear experimental tests for "quantum behavior" in a system. This issue has been addressed in the past in the form of the inequalities due to Bell and those due to Leggett and Garg. These inequalities concern the results of ideal projective measurements,… (More)

We have analyzed theoretically the operation of the Bayesian quantum feedback of a solid-state qubit, designed to maintain perfect coherent oscillations in the qubit for arbitrarily long time. In particular, we have studied the feedback efficiency in presence of dephasing environment and detector nonideality. Also, we have analyzed the effect of qubit… (More)

We show that two identical solid-state qubits can be made fully entangled ͑starting from a completely mixed state͒ with probability 1/4 just by measuring them with a detector, equally coupled to the qubits. This happens in the case of repeated strong ͑projective͒ measurements as well as in a more realistic case of weak continuous measurement. In the latter… (More)

The coherent dynamics of a superconducting phase qubit is considered in the presence of both unitary evolution due to microwave driving and continuous nonunitary collapse due to a negative-result measurement. In the case of relatively weak driving, the qubit dynamics is dominated by the nonunitary evolution, and the qubit state tends to an asymptotically… (More)

We have studied quantum coherent oscillations of two qubits under continuous measurement by a symmetrically coupled mesoscopic detector. The analysis is based on a Bayesian formalism that is applicable to individual quantum systems. Measurement continuously collapses the two-qubit system to one of the subspaces of the Bell basis. For a detector with linear… (More)

- Wenjin Mao, Dmitri V Averin, Rusko Ruskov, Alexander N Korotkov
- Physical review letters
- 2004

We develop a theory of quadratic quantum measurements by a mesoscopic detector. It is shown that the quadratic measurements should have nontrivial quantum information properties, providing, for instance, a simple way of entangling two noninteracting qubits. We also calculate the output spectrum of a detector with both linear and quadratic response,… (More)