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- 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)

- 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)

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

- Ö O Soykal, Rusko Ruskov, Charles Tahan
- Physical review letters
- 2011

A quantum mechanical superposition of a long-lived, localized phonon and a matter excitation is described. We identify a realization in strained silicon: a low-lying donor transition (P or Li) driven solely by acoustic phonons at wavelengths where high-Q phonon cavities can be built. This phonon-matter resonance is shown to enter the strongly coupled regime… (More)

- Xiaojie Hao, Rusko Ruskov, Ming Xiao, Charles Tahan, HongWen Jiang
- Nature communications
- 2014

Silicon quantum dots are a leading approach for solid-state quantum bits. However, developing this technology is complicated by the multi-valley nature of silicon. Here we observe transport of individual electrons in a silicon CMOS-based double quantum dot under electron spin resonance. An anticrossing of the driven dot energy levels is observed when the… (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)

- 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)

- Rusko Ruskov, Joshua Combes, Klaus Mølmer, Howard M Wiseman
- Philosophical transactions. Series A…
- 2012

We consider qubit purification under simultaneous continuous measurement of the three non-commuting qubit operators σ(x), σ(y), σ(z). The purification dynamics is quantified by (i) the average purification rate and (ii) the mean time of reaching a given level of purity, 1-ε. Under ideal measurements (detector efficiency η=1), we show in the first case an… (More)

- Rusko Ruskov, Alexander N Korotkov, Klaus Mølmer
- Physical review letters
- 2010

We consider the evolution of a qubit (spin 1/2) under the simultaneous continuous measurement of three noncommuting qubit operators σ(x), σ(y), and σ(z). For identical ideal detectors, the qubit state evolves by approaching a pure state with a random direction in the Bloch vector space and by undergoing locally isotropic diffusion in the perpendicular… (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)