Published on *QUROPE* (http://qurope.eu)

Fri, 2016-04-22 17:59 - Christian Joachim [1]
*References :*
- A quantum digital half adder inside a single molecule. I. Duchemin and C. Joachim, Chem. Phys. Lett., 406, 167 (2005).
- The driving power of the Quantum superposition principle for molecule-machine. C. Joachim, J. Phys., Cond. Mat., 18, S1935 (2006).
- An intramolecular digital ½ adder with a tunneling current drive and reads out. I. Duchemin, N. Renaud and C. Joachim, Chem. Phys. Lett., 452, 269 (2008).
- The design & stability of NOR and NAND logic gates constructed with 3 quantum states. N. Renaud and C. Joachim, Phys. Rev. A, 78, 062316 (2008).
*Reference :*
A controlled Quantum SWAP logic gate in a 4-Center metal complex. M. Hliwa, J. Bonvoisin and C.Joachim. In “Architecture & Design of Molecule Logic Gates and Atom Circuits”, Springer Series: Advances in Atom and Single Molecule Machines: Vol. II, p. 237 (2013), ISBN 978-3-642-33136-7
*References :*
- Realization of a Quantum Hamiltonian Computing Boolean logic gate on the Si(001):H surface. M. Kolmer, R. Zuzak, S. Godlewski, M. Szymonski, G. Dridi, C. Joachim. Nanoscale, 7, 12325 (2015).
- Mechanical conformation switching of a single pentacene molecule on Si(100)-2x1. O.A. Neucheva, F. Ample and C. Joachim, J. Phys. Chem. C, 49, 117 (2013).
*References :*
-Manipulating molecular quantum states with classical metal atom inputs : demonstration of a single Molecule NOR logic gate. W.H. Soe, X. Manzano, N. Renaud, P. De Mandoza, A. De Sarkar, F. Ample, M. M.Hliwa, A.M. Echevaren, N. Chandrasekhar and C. Joachim, ACS Nano,*5* ,1436 (2011).
- A single molecule NOR gate with Au atom inputs. W.H. Soe, X. Manzano, N. Renaud, P. De Mandoza, A. De Sarkar, F. Ample, M. Hliwa, A.M. Echevaren, N. Chandrasekhar, C. Joachim, Phys. Rev. B, 83, 155443 (2011).
- Manipulation of a single molecule ground state by means of gold atom contacts. C.Manzano, W.H. Soe , M. Grisolia, M. Hliwa and C.Joachim, Chem. Phys. Lett, 587, 35 (2013).
- Large starphene single molecule NOR Boolean logic gate. C. Manzano, W.H. Soe, P. de Mandoza, PR. McGonical, A.M. Echavaren and C. Joachim, Chem. Phys. Lett., (2016) submitted.
*References :*
- Plasmonic Purcell factor and coupling efficiency to surface plasmons. Implications for addressing and controlling optical nanosources. G Colas des Francs, J Barthes, A Bouhelier, J C Weeber, A Dereux, A Cuche and C Girard, J. Opt. 18 (2016) in press. (Special issue on *Quantum plasmonics*)
- Near-field hyperspectral quantum probing of multimodal plasmonic resonators
A. Cuche, M. Berthel, U. Kumar, A. Drezet, S. Huant, E. Dujardin, C. Girard, G. Colas des Francs. 2016, submitted
- Reconfigurable modal Boolean logic gates inside a single plasmonic cavity, U. Kumar, S. Viarbitskaya, C. Girard, A. Cuche, A. Bouhelier, E. Dujardin, 2016, submitted
*References:*
- Classical Boolean Logic gates with Quantum System. N. Renaud and C. Joachim, J. Phys. A, 44, 155302 (2011).
- Quantum Design rules for single molecule logic gates. N. Renaud, M. Hliwa et C. Joachim, Phys. Chem. Chem. Phys., 13, 14404 (2011).
- The different designs of molecule logic gates. C. Joachim, N. Renaud and M. Hliwa, Adv. Materials, 24, 312 (2012).
- The mathematics of a QHC ½ adder Boolean logic gate. G. Dridi, R. Julien, M. Hliwa, C. Joachim, Nanotechnology, 26, 344003 (2015).
*References:*
- Conductance of a single flexible molecular wire composed of alternating Donor and Acceptor units. C.Nacci, F. Ample, D. Bleger, S. Hecht, C. Joachim and L. Grill, Nature Comm., 6, 7397 (2015).
- Electronic and magnetic communication in mixed-valent and homovalent ruthenium complexes containing phenylcyanamide type bridging ligands. M. Fabre, J. Bonvoisin. JACS. 129, 1434 (2007)
- Manipulating and squeezing the photon density of states with plasmonic nanoparticle networks. C. Girard, E. Dujardin, R. Marty, A. Arbouet, G. Colas des Francs. Phys Rev. B., 2010, 81, 153412
- Tailoring and imaging the plasmonic local density of states in crystalline nanoprisms. S. Viarbitskaya, A. Teulle, R. Marty, J. Sharma, C. Girard, A. Arbouet and E. Dujardin. Nature Materials, 2013, 12, 426-432.
- Multimodal plasmonics in fused colloidal networks A. Teulle, M. Bosman, C. Girard, K. L. Gurunatha, M. Li, S. Mann, E. Dujardin. Nature Materials, 2015, 14, 87-94
- Near-field hyperspectral quantum probing of multimodal plasmonic resonators. A. Cuche, M. Berthel, U. Kumar, A. Drezet, S. Huant, E. Dujardin, C. Girard, G. Colas des Francs. 2016, submitted
- Modulated information transfer though delocalized plasmon mode engineering. U. Kumar, S. Viarbitskaya, C. Girard, A. Cuche, A. Bouhelier, E. Dujardin, 2016, submitted
*References:*
- Conductance decay of surface Hydrogen tunnelling junction fabricated along a Si(100)-(2x1)H atomic wire. H. Kawai, Y.K. Yeo, M. Saeys and C. Joachim, Phys. Rev. B, 81, 195316 (2010).
- Si(100)H surface Dangling bond atomic wire enginnering. M. Kepenenkian, R. Robles, C. Joachim and N. Lorente, NanoLett. 13, 1192 (2013).
*References:*
-Atomic scale fabrication of dangling bond structures on hydrogen passivated Si(001) wafers processed and nanopackaged in a clean room environment. M. Kolmer, S. Godlewski, R. Zuzak, M. Wojtaszek, C. Rauer, A. Thuaire, J.M. Hartmann, H. Moriceau, C. Joachim and M. Szymonski__,__, Appl. Surf. Sci., 288, 83 (2014)
- Imaging Single atom contact and single Atom manipulation at Low Temperature using the new ScientaOmicron LT-UHV 4 STM. J. Yang, D. Sordes, M. Kolmer, D. Martrou and C. Joachim, Eur. J. Phys. AP, 73, 10702 (2016).
*References :*
- A time-dependant approach to electronic transmission in model molecular junctions. N. Renaud, M. Ratner and C. Joachim, J. Phys. Chem. B, 115, 5582 (2011).
- Contact conductance of a graphene nanoribbon with its graphene Nano-electrodes. S. Srivastava, H. Kino and C. Joachim, Nanoscale, in press (2016)
- Parallel quantum circuit in a tunnel junction. O. Faizy, G. Dridi, C. Joachim, Sci. Rep. (2016) submitted.

### Location

Website:

www.cemes.fr/GNS [2]

Research Type:

Theory

Experiment

**Quantum Information Processing and Communication**

Contribution from CEMES CNRS UPR 8011

**Updated on ****29-Apr-16**

**Activity summary**

CEMES is developing quantum technology based on a dual approach using (1) single molecular design and atom manipulation on surfaces to create quantum circuits and logic gates and (2) plasmonic circuits and modal logic gates coupled to single photon sources (**QIPC 4.2 [1]**). By a combined theoretical and experimental effort sustaining both approaches, CEMES aims at downsizing quantum information processing and communication to devices with footprint as small as 1 nm2 and interconnects as narrow as 1 nm, a formidable challenge for miniaturizing the mainstream QIPC paradigms (qubits or trapped atoms). Quantum control in a nanometer-scale single molecule or atom circuits is achieved by manipulating electronic quantum states by the presence of adatoms in order to implement quantum logic gates and, in the longer term, by using single molecule latching (

**Detailed expertise**

**1. Quantum control theory (QIPC 4.3)**

** Theory :** Trajectory in state space. Decoherence and trajectory control by modifying the Hamiltonian generating the quantum evolution on the Bloch hypersphere. Quantum control robustness.

**2. Qubit-based quantum computing (QIPC4.2.6)**

*Experimental **:* Synthesis and spectroscopy probing of a molecule-SWAP

*Theory ***:** Design of intramolecular qubits in complex multicenter mixed-valence compounds.

**3. Qubit-free quantum computing (New section QIPC 4.2.7 ? (exp.), 4.3.1 (theor.))**

*Quantum atom circuits***:** Implementation of a NOR gate with 10 dangling bonds on Si(100)H surface. Design of all 2-inputs, 1-output Boolean logic gates. Bistable molecules as logic input.

*Quantum molecular logic gates***:** Manipulation of electronic states in a single molecule by using single Au atoms as inputs. Implementation of a NOR, a XOR gate and an analogic adder.

*Quantum plasmonic logic gates***:** Implementation of multiple input/output reconfigurable logic gates in confined 2D plasmonic architectures for high speed bosonic transfer functions at room temperature. The quantum plasmonic state is populated from a quantum photon source.

** Theory :** Quantum graph theory applied to the design of bollean logic gates. Quantum Hamiltonian Computing so far up to a 2x2 bit adder with carry.

**4. Quantum communication in complex circuits (QIPC 4.1.2 to 4.1.5)**

** Experimental :** 2D plasmon mode design for long distance quantum information transfer and modal logic gate implementation. Decoherence control and coupling of single photon source to single plasmon for plasmon-mediated long distance entanglement. Quantization of plasmon in nanoscale 1D channels for quantum information transfer.

Super tunneling; long distance state correlation through an atomic scale quantum channel: atom wire, low effective mass molecular wires. Very long distance tunneling for quantum information exchange in complex quantum computing structures. Modulation of the long-range intramolecular spin-spin entanglement with the magnetic molecular orbital topology.

** Theory :** Complex value band theory, zero effective mass in tunnelling regime. Entangled states in Hilbert space.

**5. Atom Technology (QIPC 4.3.4 & 4.5)**

*Experimental ***:** Atom-by-atom construction of Boolean quantum Hamiltonian logic gates at a semi-conductor surface with the low-temperature, UHV 4 probe STM in CEMES PicoLab.

*Theory ***:** Classical-quantum and quantum-classical conversion theory for atomic or molecular circuit input/output. Band structure optimization for metallic nanopads and pointer states.

**[1]*** Refers to sections of the QIPC roadmap (version 1.8) which can be found at: **http://qurope.eu/content/qipc-roadmap* [3]

Leader:

Christian Joachim

Pico-Lab CEMES CNRS

29 Rue J. Marvig

Toulouse 31055
France

Phone:
+33 562 25 78 35

**Links:**

[1] http://qurope.eu/users/ioachim

[2] http://www.cemes.fr/GNS

[3] http://qurope.eu/content/qipc-roadmap

[4] http://qurope.eu/category/virtual-facility/quantum-engineering

[5] http://qurope.eu/category/virtual-institute/quantum-computation