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Highlights for Q-ESSENCE


Latest research on noisy quantum simulations hits the cover of the APS Physics

physics.aps.org/viewpoint-for/10.1103/PhysRevLett.107.12050

Prof. Dan Browne from the University College London in the newest issue of APS Physics writes about the QEssence's researchers latest discovery (prl.aps.org/abstract/PRL/v107/i12/e120501) that using a quantum computer to simulate another quantum system will work even when the modeled system is not isolated from its environment.

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Dissipative Quantum Church-Turing Theorem

We show that the time evolution of an open quantum system, described by a possibly time dependent Liouvillian, can be simulated by a unitary quantum circuit of a size scaling polynomially in the simulation time and the size of the system. An immediate consequence is that dissipative quantum computing is no more powerful than the unitary circuit model.

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A new product by ID Quantique awarded with CLEO Innovation Award
 
ID Quantique, a partner in the Q-ESSENCE consortium, is developing a new product – new single photon detection module called id210. The development of this module is possible partly due to Q-ESSENCE support. The first version of id210 was already presented at CLEO - Laser Focus World, and Laser - World of Photonics, winning the CLEO/Laser Focus World Innovation Award 2011 Honorable Mention.
The id210 brings a major breakthrough for single photon detection at telecom wavelengths. Its
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Permutationally Invariant Quantum Tomography

We present a scalable method for the tomography of large multiqubit quantum registers. It acquires information about the permutationally invariant part of the density operator, which is a good approximation to the true state in many relevant cases. Our method gives the best measurement strategy to minimize the experimental effort as well as the uncertainties of the reconstructed density matrix. We apply our method to the experimental tomography of a photonic four-qubit symmetric Dicke state.

 

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Quantum memory for entangled continuous-variable states
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