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7 papers · 2 filters
Detection of quantum critical points by a probe qubit
Jingfu Zhang, Xinhua Peng, Nageswaran Rajendran +1
Quantum phase transitions occur when the ground state of a quantum system undergoes a qualitative change when an external control parameter reaches a critical value. Here, we demon…
Optimization of Short Coherent Control Pulses
S. Pasini, T. Fischer, P. Karbach +1
The coherent control of small quantum system is considered. For a two-level system coupled to an arbitrary bath we consider a pulse of finite duration. We derive the leading and th…
Iterative quantum state transfer along a chain of nuclear spin qubits
Jingfu Zhang, Nageswaran Rajendran, Xinhua Peng +1
Transferring quantum information between two qubits is a basic requirement for many applications in quantum communication and quantum information processing. In the iterative quant…
Spin Description in the Star Product and the Path Integral Formalism
S. Odendahl, P. Henselder
The spin can be described in the star product formalism by extending the bosonic Moyal product in the fermionic sector. The fermionic star product is then the Clifford product of g…
Experimental Observation of a Topological Phase in the Maximally Entangled State of a Pair of Qubits
Jiangfeng Du, Jing Zhu, Mingjun Shi +2
Quantum mechanical phase factors can be related to dynamical effects or to the geometrical properties of a trajectory in a given space - either parameter space or Hilbert space. He…
Effect of system level structure and spectral distribution of the environment on the decoherence rate
Jingfu Zhang, Xinhua Peng, Nageswaran Rajendran +1
Minimizing the effect of decoherence on a quantum register must be a central part of any strategy to realize scalable quantum information processing. Apart from the strength of the…