# Superradiance as a source of collective decoherence in quantum computers

@article{Yavuz2014SuperradianceAA, title={Superradiance as a source of collective decoherence in quantum computers}, author={Deniz D. Yavuz}, journal={Journal of The Optical Society of America B-optical Physics}, year={2014}, volume={31}, pages={2665-2670} }

We analyze the radiative coupling of qubits to a common radiation bath in free space and discuss that superradiance (collective emission) results in decoherence that scales with the square of the number of qubits. This decoherence mechanism is nonlocal; the collective emission simultaneously decoheres all the qubits in the computer. Because the noise source is not local, the introduced errors are outside the applicability of the threshold theorem. As a result, we argue that the errors due to…

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## References

SHOWING 1-10 OF 35 REFERENCES

Algorithm-based analysis of collective decoherence in quantum computation

- Physics
- 2004

In a quantum computer, qubits are often stored in identical two-level systems separated by a distance shorter than the characteristic wavelength of the reservoirs that are responsible for…

Resilient quantum computation in correlated environments: a quantum phase transition perspective.

- PhysicsPhysical review letters
- 2007

The problem of a quantum computer in a correlated environment protected from decoherence by quantum error correction using a perturbative renormalization group approach is analyzed and the "threshold theorem" of quantum computing is rephrased as a dimensional criterion.

Decoherence-Free Subspaces for Quantum Computation

- Physics
- 1998

It is shown that decoherence-free subspaces are stable to perturbations and, moreover, that universal quantum computation is possible within them.

Fault-tolerant quantum computation with long-range correlated noise.

- PhysicsPhysical review letters
- 2006

It is shown that an arbitrarily long quantum computation can be executed with high reliability in D spatial dimensions, if the perturbation is sufficiently weak and decays with the distance r between the qubits faster than 1/r(D).

Theory of decoherence-free fault-tolerant universal quantum computation

- Physics
- 2001

Universal quantum computation on decoherence-free subspaces and subsystems (DFSs) is examined with particular emphasis on using only physically relevant interactions. A necessary and sufficient…

CONCATENATING DECOHERENCE-FREE SUBSPACES WITH QUANTUM ERROR CORRECTING CODES

- Physics
- 1999

An operator sum representation is derived for a decoherence-free subspace (DFS) and used to (i) show that DFS’s are the class of quantum error correcting codes (QECC’s) with fixed, unitary recovery…

Is Fault-Tolerant Quantum Computation Really Possible?

- Physics
- 2006

The so-called "threshold" theorem says that, once the error rate per qubit per gate is below a certain value, indefinitely long quantum computation becomes feasible, even if all of the qubits…

Quantum computation with quantum dots

- Physics
- 1998

We propose an implementation of a universal set of one- and two-quantum-bit gates for quantum computation using the spin states of coupled single-electron quantum dots. Desired operations are…

Error Correcting Codes in Quantum Theory.

- PhysicsPhysical review letters
- 1996

It is shown that a pair of states which are, in a certain sense, “macroscopically different,” can form a superposition in which the interference phase between the two parts is measurable, providing a highly stabilized “Schrodinger cat” state.